Question: Which is the following is 3 DES encryption? c = DESk 3 ( DESk 2 ( DESk 1 ( m ) ) c = DES

Which is the following is 3DES encryption?
c=DESk3(DESk2(DESk1(m))
c=DES-1k3(DESk2(DESk1(m))
c=DESk3(DES-1k2(DESk1(m))
c=DESk3(DESk2(DES-1k1(m))

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