What is the correct direct speech version? The security guard warned the customers not to enter the server room. (not)

Question

What is the correct direct speech version?  The security guard warned the customers not to enter the server room.  (not)

Accepted Answer

"Don’t go into the server room," the guard warned.

Answer

"Not to go into the server room," warned the guard.

Answer

"You must not enter the server room!" warned the guard.

Answer

"Please, don’t walk into the server room," the guard said.

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