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Read the following directions carefully and answer the questions and mark as follows:

Two concentric circles $C1$ and $C2$ with radii $r1$ and $r2$. The circles are such that $C1$ fully encloses $C2$, then what is the radius of $C1$?

1. The difference of their circumference is $k$ cm.

2. The difference of their areas is m sq. cm.

1. If any one of the statements alone is sufficient to answer the question.
2. If both statements individually are sufficient to answer the question.
3. If both statements together are required to answer the question.
4. If both statements are not sufficient to answer the question.

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