When Goods Are Sold by Tender,the Offer Is Accepted and the Contract

When goods are sold by tender,the offer is accepted and the contract is formed:

A) according to the terms on which the invitation to tender is made.
B) as soon as the announcement is made by the seller.
C) when the tenderer accepts the sellers offer by submitting a tender.
D) when the seller accepts the tenderer's offer by accepting the tender.