This dialog is for questions 13 to 16. Rossa Hi, guys. Has everybody joined the group? Zain, Alena, Damar: Yes. Rossa : Can you turn on your camera and mute your microphone before starting our discussion? Please click 'Raise hand' button to let us know that you want to speak. Then, turn on your microphone. Let's start our discussion. Zain, Alena, Damar: O.K. HOTS (13.) What are the speakers doing? a. Join an online class b. Meet old friends online C. Check their microphones d. Have an online group discussion 14. When does someone have to click 'Raise hand'? HOTS (15.) Who is Rossa? a. The teacher b. Zain's sister c. Damar's old buddy d. The leader of the group a a. When he/she wants to leave b. When he/she is going to speak c. When he/she will turn off the microphone d. When he/she will turn on the camera a. b. Attended S T 16. "Has everybody joined the group?" What is the closest meaning of joined': Sent c. Submitted d. Registered​