To communicate across longer distances, mobile devices can use ____, a standard high-speed wireless communication. 

A(n) ____________________ system contains pseudo-services that emulate well-known services, but is configured in ways that make it look vulnerable to attacks.

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

FIGURE 6-1Figure 6-1 above shows the Student variable before and after it has been assigned the value ____.

A. void B. 0 C. null D. \