The symbolic representation of four logic gates are given below : (i)
(ii)
(iii)
(iv)
The logic symbols for OR, NOT and NAND gates are respectively :

• A

  (i), (iii), (iv)
• B

  (iii), (iv), (ii)
• C

  (iv), (i), (iii)
• Correct answer
  D

  (iv), (ii), (i)

Hence, the correct answer is option: 'D'.