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Alberto works with an advertising agency. He attends the agency’s video conference with a few clients. Which TWO actions convey that Alberto understands the etiquette of virtual meetings?

He mutes his microphone when he’s not speaking.
He drums his fingertips on the desk.
He chews gum and looks at the floor.
He introduces himself to the other people on the call.
He arrives to the venue 10 minutes late.