When coordinating the VMware NMP and any installed third-party MPPs, the PSA performs which
of the following tasks?

A.
Implements logical device bandwidth sharing

B.
Processes I/O requests to logical devices

C.
Associates physical paths with logical devices

D.
Manages physical path claiming and unclaiming

Explanation:
PSA = Pluggable Storage Architecture
NMP = Native Multipathing
the rest are performed by NMP. For reference please refer to page 23-24 of this document http://www.vmware.com/pdf/vsphere4/r40/vsp_40_san_cfg.pdf