The Defence ministry gave private sector banks permission to offer financial support to it for the purchase of military equipment abroad. Which of the following bank got the approval?

The correct option is All a, b & c (which includes ICICI Bank, Axis Bank, and HDFC Bank).

Detailed Explanation:
Previously, only public sector banks were authorized to provide financial services, such as Letter of Credit (LC) and Direct Bank Guarantee (DBG) facilities, to the Ministry of Defence for procurement of military equipment from foreign countries.
To promote competitive efficiency and ease of business, the Ministry of Defence expanded this authorization to private sector banks. Under this scheme, three major private sector banks were approved:
1. ICICI Bank
2. Axis Bank
3. HDFC Bank

These banks can now offer financial support and credit services for overseas military purchases, alongside selected public sector banks. Therefore, all three banks (a, b, and c) have received the approval.