Buy back of shares can be done out of which of the following sources?

All of these

The correct answer is option 4- All of these.

When a company purchase its own shares, it is called ‘Buy-back of Shares’. Section 68 of The Companies Act, 2013 provides that the company can buy their own shares from either of the following sources :
(a) Existing equity shareholders on a proportionate basis
(b) Open Market
(c) Odd-lot shareholders
(d) Employees of the company