Which of the following statements are correct about delegates? 1. Delegates are not type-safe. 2. Delegate is a user-defined type. 3. Only one method can be bound with one delegate object. 4. Delegates can be used to implement callback notification. 5. Delegates permit execution of a method on a secondary thread in an asynchronous manner.

• A. 1 and 2 only
• B. 1, 2 and 3 only
• C. 2, 4 and 5 only
• D. 4 and 5 only