Bernie Owes an Undisputed Amount to Wilde's Heating & Air

Bernie owes an undisputed amount to Wilde's Heating & Air Conditioning.Which of the following is true?

A) If Wilde's agrees to accept less than the full amount as full payment,the agreement is not binding.
B) The undisputed amount is also known as an unliquidated amount.
C) If the parties agree to settle for less than the full amount,their agreement is governed by the ruling in Henches v.Taylor.
D) If Wilde's agrees to accept less than the full amount,the agreement is only binding if it is in writing and signed by Bernie.