Which of the following statements are true about Bandwidth Management Hierarchies and Priorities? (Choose all that apply

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Which of the following statements are true about Bandwidth Management Hierarchies and Priorities? (Choose all that apply)
(a) Child classes can have children of their own.
(b) If no limit is set, packets are sent as soon as they arrive.
(c) Priorities are set to a class to give precedence over other classes.
(d) If there is excess bandwidth, the child class will always get the first opportunity to use it.

A. a, b & c only
B. a, b & d only
C. b, c & d only
D. All of the above