One important difference between the command line interface and a GUI interface is that __________.

a. in command line the background color of the monitor will always be black but in a GUI it can be any color
b. in a GUI environment the user determines the order in which things happen while the user has no control over the order or events in a command line interface
c. users must type information in a command line interface but, when using a GUI, typing is never required
d. All of these are important differences.

b. in a GUI environment the user determines the order in which things happen while the user has no control over the order or events in a command line interface