Which two statements are true about java Cryptography Architecture (JCA)?

Which two statements are true about java Cryptography Architecture (JCA)?

A.
Implementations of cryptographic algorithms can be plugged in to a JVM after it has been
installed and at run time.

B.
Categories of algorithms supported by JCA include message digests, signatures
encryption, management, and random number generation.

C.
Exactly one Implementation of each category of cryptographic algorithms must be
provided.

D.
Any JCA provider must implement each supported category of algorithms.