Consider the following statements. 1) Umbra is a shadow of total darkness. 2) Penumbra is a shadow of partial darkness. 3) An extended source in general, produces umbra as well as penumbra.

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Consider the following statements.
1) Umbra is a shadow of total darkness.
2) Penumbra is a shadow of partial darkness.
3) An extended source in general, produces umbra as well as penumbra.

a) 1, 2 only
b) 2, 3 only
c) 1, 2, 3
d) 1, 3 only

Answer: c) 1, 2, 3