Symbol is used in the "advanced" section of the time range picker to round down to nearest unit of specified time.

@(at sign) is the correct answer to the following statement.

Explanation:

Because the following symbol is the "at sign" symbol that is used for the Advanced section in the time range picker that lets the user search for the specified time for the round down the closest entity of a particular period. So, that's why the following answer is correct for the following statement.

you can not change you age soon as you signed up. the only way is too delete your account and use another account to sign up and put your correct age.

b and c ( ip address and port number)