Peaking shall not exceed Â½". This is measured using a horizontal sweep board of what dimensions?

The sweep board shall be 48" long and made to the true outside radius of the tank

The sweep board shall be 48" long and made to the true inside radius of the tank

The sweep board shall be 36" long and made to the true outside radius of the tank

The sweep board shall be 36" long and made to the true inside radius of the tank