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Which of the following conditions is/are necessary for a hypothesis test concerning inference on two-proportions?

I. The data must be from a simple random sample.

II. ${ { n }_{ 1 } }(p),{ { n }_{ 1 } } \times (1-p),{ { n }_{ 2 } }(p)$ and ${ { n }_{ 2 } }(1-p)$ must all be greater than $5$, where ${ { n }_{ 1 } }$ and ${ { n }_{ 2 } }$ are the sizes of the first and second samples, respectively, and p is the pooled sample proportion.

III. The samples must be stratified.

A

I only.

B

II only.

C

III only.

D

I and II only.

E

II and III only.

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