Final answer:
A licensee can have their license suspended or revoked for placing a For Sale sign on a property without the seller's permission, as this is a violation of regulations.
Step-by-step explanation:
Under certain circumstances, a licensee can have their license suspended or revoked. One such circumstance is placing a For Sale sign on a property without the seller's permission, which is a violation of real estate regulations and ethical standards. The other options mentioned, such as not attending industry seminars, offering discounts to clients, or failing to renew the license on time, do not typically result in suspension or revocation, although failing to renew can lead to an expired status preventing lawful practice.