Your company is developing an application for iOS devices. The members having these devices will receive the application via Visual Studio App Center. The members are part of a private distribution. 
Which of the following certificate type is used for the distribution of the application via the App Center?

Answer options:

A..cer
B..pvi
C..pfx
D..p12

Answer – D 
The certificate must be of the .p12 format. This is also given in the Microsoft documentation. 

Since this is clearly given in the Microsoft documentation, all other options are incorrect. 
For more information on managing distribution groups, please visit the below URL- 

https://docs.microsoft.com/en-us/appcenter/distribution/groups