What Is the Distinction Between Primary Reinforcers and Secondary Reinforcers

What is the distinction between primary reinforcers and secondary reinforcers

A)  Primary reinforcers are internal, while secondary reinforcers come from the environment. 
B)  Primary reinforcers are associated with classical conditioning, while secondary reinforcers are associated with operant conditioning. 
C)  Primary reinforcers are used first, while secondary reinforcers are used if primary reinforcers are not effective. 
D)  Primary reinforcers satisfy biological needs, while secondary reinforcers depend on learning.