Two electronics technicians are measuring electrical quantities in circuits. Technician A says that copper, glass, porcelain, and carbon are all examples of resistors. Technician B says that when the resistance in a circuit is increased, the current flow will decrease. Which of the following statements is correct? 

       A. Only Technician B is correct.   B. Neither of the two technicians is correct.   C. Only Technician A is correct.   D. Both Technician A and Technician B are correct.