What is a valid Host I/O limit setting for this configuration?

A PowerMax parent Storage Group (SG) contains two child SGs: SG1 and SG2 .

What is a valid Host I/O limit setting for this configuration?
A . Parent SG: 400,000
SG1: 800,000
SG2: 300,000
B . Parent SG: 500,000
SG1: 400,000
SG2: NOLIMIT
C . Parent SG: 500,000
SG1: NOLIMIT
SG2: 1,000,000
D . Parent SG: 400,000
SG1: 500,000
SG2: NOLIMIT