Correct Answer: Full of talk, but low on action

Solution : The fourth option is correct.

The idiom all bark and no bite means that someone who talks a lot without taking effective action.

It describes a person who makes a lot of threats or boasts but does not follow through with real or significant actions. In other words, the individual may seem aggressive or intimidating verbally, but he lacks the capability or willingness to carry out his words with meaningful deeds.