Which statements are true?

Which statements are true?
A . Ports may carry flows of any sort of Block, Signal, or ValueType.
B . Part properties can also have Ports, and their Ports can have Connectors to internal Parts, Ports of internal Parts, or to boundary Ports of a Block
C . A Block can have Ports, and Ports can have Connectors to internal Parts or Ports of Parts.

Answer: ABC