A customer has a fully paid options position and is long marginable stock. Subsequently he receives a margin call on his long stock position. Which of the following statements are TRUE?

I The customer can borrow against long options contracts to satisfy a portion of the margin call
II The customer cannot borrow against the long options contracts to satisfy the margin call
III Long option contracts have a loan value of 0%
IV Long option contracts have a loan value of 50%

a. I and III
b. I and IV
c. II and III
d. II and IV