Which two tasks does the Pluggable Storage Architecture (PSA) perform?

Which two tasks does the Pluggable Storage Architecture (PSA) perform? (Choose two.)
A. Handles I/O queueing to the logical devices.
B. Handles physical path discovery, but is not involved in the removal.
C. Handles physical path discovery and removal.
D. Handles I/O queueing to FC storage HBAs.