An exclusive listing MUST be in writing and it MUST:

Allexclusive listing agreements in Pennsylvania MUST specify their duration in writing.

49 Pa. Code § 35.332 (Exclusive Listing Agreements)states thatall exclusive listings must have a definite start and end date.

Listings without an expiration date are considered illegaland unenforceable in Pennsylvania.

Why the other answers are incorrect:

Option A (Cancellation in 24 Hours):There is no legal requirement for a 24-hour cancellation clause.

Option B (Financing Arrangements):Financing provisionsare not a required part of a listing agreement.

Option C (Signed by Cooperating Broker):A cooperating broker’s signatureis not required. Only the listing broker and seller need to sign the agreement.