Before entering an all-ages nightclub, a person must show his identification to the bouncer to establish whether or not he is permitted to drink alcohol (that is, he is at least 21 years old). If the entrant is at least 21, the bouncer stamps his hand with a green checkmark and allows the person to enter. If the entrant is not, the bouncer stamps the person's hand with a red "x" and allows him to enter. Daniel visits the nightclub and receives the green checkmark on his hand. In litigation about that night, the prosecution needs to prove Daniel was over 21 years old. The prosecution calls a witness who saw Daniel's hand and will testify that she saw a green checkmark. If offered to prove that Daniel is over 21 years old, is the testimony admissible?

Group of answer choices

A. Yes, the stamp is not a statement.

B. Yes, the witness is testifying to her personal observation.

C. No, the stamp is hearsay.

D. No, the stamp is irrelevant because the bouncer may have mistakenly given the green checkmark rather than the red "x."