What is the difference between a hex bolt and a socket cap screw?

What is the difference between a hex bolt and a socket cap screw?

• A. Hex bolt requires a wrench; socket cap uses a hex key or Allen key
• B. Hex bolt uses a hex key; socket cap uses a screwdriver
• C. Hex bolt is always smaller than a socket cap
• D. Hex bolt has a round head; socket cap has a square head

Answer: (A)