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: a. Indicates inheritance b. Causes a compiler error c. Is unnecessary because the CommissionEmployee constructor is called automatically d. Invokes the CommissionEmployee constructor with arguments

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