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With reference to the carbon nanotubes, consider the following statement:

1. They can be used as the carriers of drugs and antigens in the human body. 2. They can be made into the artificial blood capillaries for an injured part of human body. 3. They can be used in biochemical sensors. 4. Carbon nanotubes are biodegradable.

Which of the statements given above are correct?

(a) 1 and 2 only
(b) 2, 3 and 4 only
(c) 1, 3 and 4 only
(d) 1, 2, 3 and 4