Which of the following is correct?

Question 5 options:

a. A contract that does not provide a specific price for goods will never be enforceable.

b. If a contract does not specify a price but provides for an external market factor to determine this, the contract will likely be enforceable.

c. A prudent buyer will request a pro forma or sample invoice to ensure that all the buyer's import and customs regulations are adhered to.

d. Only (a) and (b) are correct.

e. Only (b) and (c) are correct.