Meaning of: 'Welcome back everybody in this session'

[YANNY]

Test No. incompl/elem-18 "Making an Appointment", question 1

Welcome back ......... in this session - we're going to take a look at some of the vocabulary we used in session 2.

(a) somebody
(b) everybody
(c) anybody
(d) nobody

Test No. incompl/elem-18 "Making an Appointment", answer 1

Welcome back everybody in this session - we're going to take a look at some of the vocabulary we used in session 2.

Correct answer: (b) everybody
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WHAT IS THE MEANNING OF THIS SENTENCE?

YANNY

[Mister Micawber]

The teacher is welcoming the students back to a subsequent class or program. They were previously attending 'session 2', a previous class, together.
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Native English teacher at Mister Micawber's

[Narayanan Krishnaswamy]

[Katarzyna]

This should have been this way:

Welcome back everybody - in this session, we're going to take a look at some of the vocabulary we used in session 2.
Narayanan

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I don't think so. It has changed the meaning.

In the original sentence the speaker simply wants to say hello to all the students who take part in this sessions (= those who probably took part in the previous ones).

Kasia