Select the correct indirect form of the given sentence.

The guard said to the visitors, "Do not take photographs inside the museum."

The guard forbade the visitors to take photographs inside the museum.

The correct indirect form of the given sentence is:

The guard forbade the visitors to take photographs inside the museum.

The other options are incorrect:

• The guard told the visitors that do not take photographs inside the museum. - This is incorrect because the modal verb "do not" in the reported speech is grammatically incorrect.
• The guard warned the visitors not to be taking photographs inside the museum. - This is incorrect because the verb "be taking" in the reported speech suggests that the guard was warning the visitors to stop taking photographs, but the original sentence is a prohibition against taking photographs in the first place.
• The guard requested the visitors to not took photographs inside the museum. - This is incorrect because the modal verb "took" in the reported speech is in the past tense, but the reporting verb "said" is in the past tense.