Which statement correctly describes 3DES encryption algorithm?

Which statement correctly describes 3DES encryption algorithm?
A . It is a block cipher algorithm but weaker then DES due to smaller key size.
B . It is an asymmetric algorithm with a key size of 168 bits.
C . It does decryption in reverse order with the same set of keys used during encryption
D . It uses a set of three keys for encryption and a different set of three keys for encryption
E . It is a block cipher algorithm with a key size of 56 bits.
F . It is stream cipher algorithm with a key size of 168 bits.

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Answer: C