What is the best definition of a soliloquy?

A type of monologue in which a character speaks to themselves, revealing their innermost thoughts and feelings
A song performed by a group of singers during which they reveal a character's innermost thoughts and feelings
A type of monologue in which a character speaks to the audience, revealing secrets or emotions other characters can't hear
A narrator's observations about a character's innermost thoughts and feelings

The best definition of a soliloquy is: A type of monologue in which a character speaks to themselves, revealing their innermost thoughts and feelings.