Where does the DB2 Problem Determination tool (db2pd) get information from?

A.
DB2 memory sets

B.
the db2diag.log file

C.
Monitoring table functions

D.
A set of pre-defined event monitors

Explanation:
https://www.ibm.com/developerworks/data/library/dmmag/DMMag_2011_Issue2/DistributedDBA/
DistributedDBA-pdf.pdf