Fine Art Corp. sent a written offer to buy 10,000 pencils for a total of $10,000 from Faber Pencil Co. Both parties are merchants. Faber can accept the offer by:
a) Promising to ship the pencils.
b) Promptly shipping the pencils.
c) Accepting the offer on Faber’s own written standard form contract.
d) All of the above could be valid acceptance.