What statement is true if a port delegates to multiple ports on subordinate components?

What statement is true if a port delegates to multiple ports on subordinate components?
A . at execution time, signals will be delivered from the subordinate ports to the delegating port
B . subordinate ports must collectively offer the delegated functionality of the delegating port
C . subordinate ports must be type compatible with the delegating port
D . multiple delegation is not allowed

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Answer: B