Explanation:

- Option 1: A reliable person

- This is the correct meaning. A "safe pair of hands" refers to someone you can trust to handle a task well and not make mistakes.

- Correct Answer

- Option 2: A person who does many jobs

- This describes a versatile or multitasking individual, not necessarily someone deemed reliable for a specific task.

- Option 3: A happy person

- Happiness doesn't correlate with the idiom's implication of reliability and competence.

- Option 4: A person who guards someone

- A guard may need to be reliable, but this option doesn't capture the idiom's broader sense of dependability in varying tasks.