which describes a random selection procedure?

a a computer program randomly selects 100 students, splits the list in half alphabetically, and accordingly sends one of the two new forms of the report

card.

b. flip of a coin determines which of the two schools will be testing brand a and which will be testing brand b of computerized whiteboards offered for

comparison

c. a random process determines which researcher from the team will be observing

one of the three schools participating in a study.

d. all students located in the math building during the second hour randomly

receive one of the three survey forms.