Which of the following HTML tags define a table header?

A single PRI can deliver multiple voice calls simultaneously using which of the following Layer 1 technologies?

A. Time division multiplexing B. Analog circuit switching C. CSMA/CD D. Time division spread spectrum

The _________ approach is the opposite of the load-sharing approach and provides implicit scheduling defined by the assignment of threads to processors.

Fill in the blank(s) with the appropriate word(s).