A licensee takes a listing and receives the sellers verbal permission to post a "For Sale" sign on the property. She returns later on the same day to post the sign, but the sellers are not at home. Which of the following is TRUE?

A$-$ The sign can be posted right away, because the sellers have already authorized it$$

B$-$ The sign can be posted right away, but written permission must be obtained within$2$ days

C$-$ Putting the sign up in the sellers' absence is a violation of TREC rules.

D$-$ Putting the sign up without the sellers' written authorization is a violation of TREC rules.