Correct Answer: Command

Solution : The fourth option is the correct answer.

A mandate is a directive or authorisation to do something, often issued by an authority. Similarly, a command is an authoritative order or instruction that expects compliance.

The meanings of the other options are as follows:

1. A question means to ask or inquire about something, often seeking information or clarification.

2. A request means to politely ask for something or make a petition, expressing a desire or need.

3. To enquire means to ask for information or seek clarification.

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Therefore, the correct answer is command.