Explanation:

- ASBA (Application Supported by Blocked Amount) applications in the capital market can be made through specific channels.

- This process allows investors to apply for shares while the application amount is blocked in their bank account.

- Option 1: POST OFFICE - Post offices are not authorized for ASBA applications.

- Option 2: SCSBs (Self-Certified Syndicate Banks) - This is correct. SCSBs are the designated banks authorized to accept ASBA applications.

- Option 3: Any Commercial Bank - Not all commercial banks are authorized for this process; only SCSBs are.

- Option 4: Only through RBI - The RBI does not handle ASBA applications directly.

- Option 5: None of the above - This option is incorrect as Option 2 is valid.