Check My Work $(2$ remaining$)$

A buyer and seller have been doing business for months without a formal contract. On Mondays, the seller delivers supplies to the buyer's business. On Thursdays, the buyer pays the invoice by mail. Is there a contract between the parties?

a$.$ In jurisdictions where the offer$-$acceptance rule is rigidly applied, there is a contract under both the UCC and the common law of contracts.

b$.$ In jurisdictions where the offer$-$acceptance rule is rigidly applied, there is no contract under either the UCC or the common law of contracts.

c$.$ Under the UCC, a contract has not been formed by the conduct of the parties.

d$.$ Under the UCC, there is no contract formed because the delivery of supplies is a service, not a good.