About Statute of Frauds.

What does pleading statute of frauds as a defense do for the defendant?

Person A enters into an oral contract with B, C and D.
1) A's oral contract with B was for B to lease property for less than 1 year.
2) A's oral contract with C was for A to hire C for less than 1 year.
3) A's oral contract with D was for C to sell office supplies(goods) for $501.

Person A, 2 days later, cancels all contracts.
B, C , and D all sue A for breach of contract. A in court pleads SOF as defense in all the cases.
What happens in each situation?