Another method that might be desired is one that updates the student's number of credit hours. this method will receive a number of credit hours and add these to the student's current hours. which of the following methods would accomplish this? a. public int updatehours( ){return hours; }b. public void updatehours( ){hours++; }c. public updatehours(int morehours){hours += morehours; }d. public void updatehours(int morehours){hours += morehours; }e. public int updatehours(int morehours){return hours + morehours; }