What is true regarding a shared, server-side parameter file for a Real Application Cluster database?

What is true regarding a shared, server-side parameter file for a Real Application Cluster database?

A.
It can contain parameters with distinct values for each instance

B.
It can contain only parameters with identical values for each instance

C.
It must contain an IFILE parameter for each instance’s individual parameters file.

D.
It must be located in the default location for the primary instance’s parameter file.