When would you use the ActivityCompat.shouldShowRequestPermissionRationale() function?
a. when a user first opens your app and you want to provide an explanation for the use of a given permission
b. when a user has previously denied the request for a given permission and selects "Tell me more"
c. when a user has previously denied the request for a given permission and you want to provide an explanation for its use
d. when a user has previously denied the request for a given permission and selected "Don't ask again," but you need the permission for your app to function
