To ensure that the selection of subjects from a subject pool is truly random, which of the following should be used? Group of answer choices Place the first person in group A, the second in B, the third in A, and so on Place the first person in group B, the second in A, the third in B, and so on Have two people pick a number from 1 to 10, placing the person who picks the highest number in group A and the person who picks the lower number in group B Flip a coin for each subject, with heads being group A and tails being group B