How do you encrypt the storage stream of the class MyOrg-HR-Work-RFP?

How do you encrypt the storage stream of the class MyOrg-HR-Work-RFP?
A . Build a site-specific encrypting cypher and select Encrypt BLOB? on the class group for MyOrg-HRWork-RFP
B . Build a site-specific encrypting cypher and select Encrypt BLOB? on the class MyOrg-HR-Work-RFP
C . Select Encrypt BLOB? on the class MyOrg-HR-Work-RFP
D . Encrypt the pzPvStream colum of the DB table mapped to MyOrg-HR-Work-RFP class using DB tools

Answer: B