The CEO of a company wants to determine whether taking the employees to a company retreat would boost their morale. He decides to survey a simple random sample of 50 of the 250 employees. Which of the following options would guarantee a simple random sample?

A simple random sample gives every group of 50 employees an equal chance of being selected. Numbering all 250 employees and randomly selecting 50 makes that possible. The first 50 to arrive are chosen by convenience, department-by-department selection may not give every possible group of 50 an equal chance, and an email survey relies on employees choosing whether to respond.

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