Is FYI a formal or informal way of communication?

Question : Which of the following is not the feature of informal communication?

Option 1: It doesnot takes place by following formal lines of communication.

Option 2: This communication spreads rapidly.

Option 3: It may leads to rumors.

Option 4: It is usually conveyed in an impersonal manner.

Question : Which of the following is not the merit of informal communication?

Option 1: It carries information rapidly.

Option 2: It fill gaps of formal communication.

Option 3: It facilitates control over work performance.

Option 4: All of the above.