Which of the following is the main reason an app advertiser would want to use a 3rd party conversion tracking company

Q) Which of the following is the main reason an app advertiser would want to use a 3rd party conversion tracking company?
Ans:

To have a single SDK to add to your app instead of one from each ad network
To receive reporting on basic usage analytics
To have more control when communicating with each ad network
To see which of an app’s new users came from recent advertising clicks or views