Which among the following Central Public Sector Enterprises is / are NOT 'Maharatnas'?

(A) Bharat Sanchar Nigam Limited

(B) Airport Authority of India

(C) Indian Oil Corporation Limited

(D) Hindustan Aeronautics Limited

Choose the correct answer from the options given below:

Option 1 -> Includes (C) Indian Oil Corporation Limited, which IS a Maharatna, so this is incorrect.

Option 2 -> Includes (C) Indian Oil Corporation Limited, which IS a Maharatna, so this is incorrect.

Option 3 -> Lists (A) BSNL (Miniratna), (B) AAI (Miniratna), and (D) HAL (Navratna) - all three are NOT Maharatnas.

Option 4 -> Includes (C) Indian Oil Corporation Limited, which IS a Maharatna, so this is incorrect.

Hence, Option 3: (A), (B) and (D) only -> BSNL and HAL hold Navratna status, while Airport Authority of India is a Miniratna. Indian Oil Corporation Limited (C) is indeed a Maharatna company, which is why it's excluded from this list. As of now, India has only a limited number of Maharatna CPSEs (including IOCL, ONGC, NTPC, Coal India, GAIL, SAIL, and BHEL among others) -> correct