Which command is used to display two different parts of the same document in the document window?

Inheritance should only be used when a(n) ______ relationship exists between the superclass and the subclass.

a) is-a b) has-a c) has-many d) similar-to

If a periodic process in the on-board train protection system is used to collect data from the trackside transmitter, how often must it be scheduled to ensure that the system is guaranteed to collect information from the transmitter? Explain how you arrived at your answer.

What will be an ideal response?