Answer:
The writing must be signed by Bob himself, or his representative or any person who has the authority to act for him.
Step-by-step explanation:
Statute of frauds is defined as a provision that only allows certain transactions will be valid only when they are in writing.
Such transactions include sale of land, transactions that are above $500, and transactions that will last over a year.
In the given scenario Bob wants to pull out of the contract because it is not enforceable according to the statue of frauds.
Alice produces a writing that she says evidences the contract.
However for this to be enforceable it must be signed by Bob himself, or his representative or any person who has the authority to act for him.