Which of the following is NOT considered a buying signal $($a$.$k$.$a$.$ expression of interest$).$

Group of answer choices

During your presentation, the prospect calls another in her office and says, "Come in here a minute, I want you to see something."

The prospect sits quietly during the entire presentation.

The prospect is constantly touching and examining the product.

The prospect is leaning forward, smiling, and nodding her head.