Which of the Following Are the Two Primary Sources of Contract

Multiple Choice

Which of the following are the two primary sources of contract law?

A) Case law and the Restatement (Second) of Contracts.
B) Case law and the Uniform Commercial Code (UCC) .
C) The Uniform Commercial Code (UCC) and the Convention on Contracts for the International Sales of Goods (CISG) .
D) Case law and the Convention on Contracts for the International Sales of Goods (CISG) .
E) The Convention on Contracts for the International Sales of Goods (CISG) and the Restatement (Second) of Contracts.