Which of the following are the characteristics of a good sample design?

1.It must result in a truly representative sample

2.It must be such which result in a small sampling error

3.It must be viable in context of funds available for the research study

4.It must be such so that systematic bias can be controlled in a better way

A1, 2 and 3 only

B1, 2, 3 and 4 only

C1, 3 and 4 only

D2, 3 and 4 only

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