How is an intramuscular injection administered in the deltoid?

• A. Insert at a 90-degree angle into the central deltoid with a suitable needle, aspirate, then inject.
• B. Insert at a 45-degree angle into the deltoid without aspiration.
• C. Insert at a 15-degree angle into the deltoid and inject.
• D. Use a 90-degree angle into the gluteal muscle.

Answer: (A)