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A large company wants to conduct a survey to determine the proportion of its female employees who practice self-defense on a daily basis. $4$ of its regional offices are randomly selected and all of the women in those offices are surveyed.

This plan is an example of which type of sampling?

A

A convenience sample.

B

A cluster random sample.

C

A simple random sample.

D

A stratified random sample.

E

A systematic sample.

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