Which statement is true for syntactically correct classes? They must have both mutator and accessor methods. They must have accessors, and optionally may have mutators. They must have mutators, and optionally may have accessors. They may have either mutator or accessor methods, or both.

Barbara is interested in pursuing a career in the science and math pathway. which qualifications will her reach that goal? a.an advanced knowledge of physics and math b.an advanced knowledge of engineering and math c. an advanced knowledge of physics and robotics an d. advanced knowledge of machinery and math