Answer: documents in A-Z's possession relating to the contract.
Explanation:
In the law of common law jurisdictions, discovery is a procedure that occurs before the trial takes place. A party, in this case Motor Sports, can acquire documentation from the other party, which is A-Z Speed, by means of discovery devices. These documents can then serve as evidence of the terms of the contract that both parties agreed to, as well as the breach of said contract by one party (A-Z Speed).