Step 1: Understanding the Concept:
Investors cannot interact directly with the depository. They need an intermediary.
Step 2: Detailed Explanation:
The Depository Participant (DP) is the agent of the depository.
Stockbrokers, banks, and financial institutions are typical DPs.
Investors open their Demat accounts with a DP to access the services provided by NSDL or CDSL.
Step 3: Final Answer:
(C) Depositary Participants