Hal's Hardware Stores and Ideal Tools, Inc., sign a written contract for a sale of goods. To be enforceable, this written contract must include

a$.$ a quantity term, such as $"50$ hammers" or $"100$ boxes of assorted nails."

b$.$ a date, such as "October $2014"$ or $"10/2014."$

c$.$ a correct title, such as "Purchase Order" or "Sales Invoice."

d$.$ the parties' contact information.