If {{MATH_680}}, what does the second derivative test tell us? {{CMD_681}} {{CMD_682}}The function has a local extremum at {{MATH_683}}.{{CMD_684}} {{CMD_685}}The function does not have a local extremum at {{MATH_686}}.{{CMD_687}} {{CMD_688}}It gives no information on whether the function has a local extremum at {{MATH_689}}.{{CMD_690}} {{CMD_691}} {{CMD_692}}