Study each of the following case. Answer the questions that follow with Yes or No.

Safran, the owner of an automobile repair shop, placed an order for an engine diagnostic machine from the Mountain Range Equipment Company. The salesperson, Rubinstein, orally assured Safran that a number of test programs for both gasoline and diesel engines would be included as part of the order. When the machine was delivered, the test programs were not included. When the buyer protested, Rubinstein claimed that Safran was mistaken and must have been thinking about another special offer the firm was running.
a. Are the oral promises Rubinstein made that supplement the written contract of sale enforceable?
b. Is it likely that Safran will gain legal satisfaction?
c. Does the parol evidence rule allow introduction of oral revisions to a contract?