A student has a choice of five different computers, three different monitors and seven different printers. How many different computer systems are possible?

15, 56, 105, or 128?

What is 5x3x7 ?

To determine the number of different computer systems possible, we need to multiply the number of options for each component.

Given that there are five different computers, three different monitors, and seven different printers, we can use the multiplication principle to calculate the total number of computer systems.

Number of computer systems = Number of computer options * Number of monitor options * Number of printer options

Number of computer systems = 5 * 3 * 7

Number of computer systems = 105

Therefore, the correct answer is 105.