Behind closed doors

Do you know the English expression “behind closed doors“? Read the conversation below. Can you guess the meaning?

Wendy: Did you go to the meeting yesterday?

Catherine: No. No one from my office did. It was held behind closed doors.

Does it mean:

a) in a small office

b) in public

c) with the door closed

d) done in secret

The answer is below!↓

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Answer: d) done in secret