Assuming the following is the beginning of the constructor definition for class BasePlus- CommissionEmployee which inherits from class Point, BasePlusCommissionEmployee:BasePlusCommissionEmployee( string first, string last, string ssn, double sales, double rate, double salary) :CommissionEmployee( first, last, ssn, sales, rate ) The second line: Select one: O a. Is unnecessary because the CommissionEmployee constructor is called automatically O b. Invokes the CommissionEmployee constructor with arguments O c. Indicates inheritance O d. Causes a compiler error