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the Pluggable Storage Architecture (PSA) performs which of the following three tasks

In vSphere 4, when multiple Multipathing Plugins (MPPs) exist, the Pluggable Storage
Architecture (PSA) performs which of the following three tasks (Choose Three)?

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A.
I/O queuing to the physical storage HBAs

B.
Association of physical paths with logical devices

C.
Management tasks such as abort or reset of logical devices

D.
Physical path discovery and removal

E.
I/O queuing to the logical devices

Explanation:
What is Pluggable Storage Architecture (PSA) and Native Multipathing (NMP)?

Pluggable Storage Architecture (PSA)
PSA is a collection of VMkernel APIs that allow third party hardware vendors to insert
code directly into the ESX storage I/O path. This allows 3rd party software developers to
design their own load balancing techniques and failover mechanisms for particular
storage array.

The PSA coordinates the operation of the NMP and any additional 3rd party MPP.

Native Multipathing Plugin (NMP)
VMware provides a generic Multipathing Plugin (MPP), called Native Multipathing
Plugin (NMP).
What does NMP do?

* Manages physical path claiming and unclaiming.
* Registers and de-registers logical devices.
* Associates physical paths with logical devices.
* Processes I/O requests to logical devices:
o Selects an optimal physical path for the request (loadbalance) [B above]
o Performs actions necessary to handle failures and requestretries.
* Supports management tasks such as abort or reset of logical devices.[C above]
Since the NMP provides B and C, the PSA must perform A, D and E


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