On an IP500 control unit that has 12 did DS30 modules configured, what is the maximum number ISDN PRI trunks that can be configured?

On an IP500 control unit that has 12 did DS30 modules configured, what is the maximum number ISDN PRI trunks that can be configured?
A . 3
B . 4
C . 6
D . 8

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Answer: C