How to get selected drop-down value in angularjs?

The JavaScript code sample as given below.

<script>

var app = angular.module('addConnectionApp', [])

app.controller('addConnectionCtrl', function ($scope) {

    $scope.companies = [{

        id: '1',

        name: 'ViaIndia'

    }, {

        id: '2',

        name: 'Invia'

    }, {

        id: '3',

        name: 'Dominos'

    }, {

        id: '4',

        name: 'Pizza'

    }];

    $scope.tents = [{

        id: '1',

        name: 'Optus'

    }];

    $scope.fName = null;

    $scope.lName = null;

    $scope.mobile = null;

    $scope.email = null;

    $scope.tenantId = 1;//This is defeult selected item.

    $scope.companyId = 1;//This is defeult selected item.

    $scope.accountNo = null;

    $scope.imsi = null;

    $scope.imei = null;

    $scope.message = null;

    $scope.addServices = function () {

        var self = $scope;

        var service = {

            FirstName: self.fName,

            LastName: self.lName,

            MobileNo: self.mobile,

            EmailID: self.email,

            IMSI: self.imsi,

            IMEI: self.imei,

            AccountNo: self.accountNo,

            Region: self.accountNo,

            TenantID: self.tenantId,

            CompanyID: self.companyId

        };

        alert(JSON.stringify(service));

    }

});

</script>

The HTML code sample as given below.

<div class="row" ng-app="addConnectionApp" ng-controller="addConnectionCtrl">

<div class="large-12 columns">

<div class="row">

<div class="large-12 columns">

<h1 class="heading-primary">New Connection</h1>

<div class="intro-primary">                 

<input type="text" ng-model="fName" placeholder="First Name" required />

<input type="text" ng-model="lName" placeholder="Last Name" required />

<input type="number" ng-model="mobile" maxlength="12" placeholder="MobileNo" required />

<select ng-model="tenantId">

    <option data-ng-repeat="ten in tents" value="{{ten.id}}">{{ten.name}}</option>

</select>

<select ng-model="companyId">

    <option data-ng-repeat="comp in companies" value="{{comp.id}}">{{comp.name}}</option>

</select>

<input type="text" ng-model="accountNo" placeholder=" company account no." required />

<input type="email" ng-model="email" placeholder="Email" required />

<input type="text" ng-model="imsi" placeholder="IMSI" required />

<input type="text" ng-model="imei" placeholder="IMEI" required />

<textarea ng-model="message" placeholder="Message"></textarea>

<div class="hide-for-small">

    <a class="button radius small yellow right" ng-click="addServices();">Create New Connection</a>

</div>

</div>

</div>

</div>

</div>

</div>