Sharon, a therapist, was a bit anxious when she realized she was scheduled for an online session. She met with the clinical director, who reassured her the session will be realistic because there will be a two-way audiovisual link between the client and herself. Additionally, the communication link between them will allow real-time interaction and there will be no perceivable delay. After hearing this, Sharon was less anxious about the upcoming session. Which of the following best describes Sharon's upcoming session?

a. secure vitual
b. synchronous
c. asynchronous
d. both