A listing agent presents their seller client with an offec. The seller agrees to the terms, signs the offer, and gives it back to their agent. Do the seller and the buyer heve a binding contract?

$($a$)$ Yes, because the offer has been signed by the seller

$($b$)$ Yes, because the signed offer has been witnessed by the listing agent

$($c$)$ Yes, because acceptance has been communicated to the listing agent

$($d$)$ No$,$ because the seller's acceptance has not been communicated to the buyer