Answer:
e. Control and Results
Explanation:
The other two principles of Google Ads are explained below:
1. Control: There is control on the scale you want to advertise and the budget you spend on campaigns. This is configured in Google Ads settings and enables tailoring to available budget.
2. Results: This is also connected to control. Users only pay for Google services used. For example if an advertisement is set up payment is only made when clicks are made to access it (pay per click).
Also the same applies to pay per call, where payment is only made when calls are attributed to Google Ads.