In which one of the sampling methods, units comprising its constituents are groups taken intact rather than individually ?

In which one of the sampling methods, units comprising its constituent

1.	In which one of the sampling methods, units comprising its constituents are groups taken intact rather than individually ?
A.	Cluster sampling method
B.	Simple random sampling method
C.	Systematic sampling method
D.	Dimensional sampling method
Answer» B. Simple random sampling method

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In which one of the sampling methods, units comprising its constituents are groups taken intact rather than individually ?

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