For measuring a low resistance by ammeter-voltmeter method, the voltmeter is connected directly across the resistance under measurement

• A.  there is an error in measurement as the ammeter measures current flowing through the voltmeter in addition to the current flowing through the resistance under measurement
• B.  there is an error in measurement as the voltmeter measures voltage drop across the ammeter in addition to that across the resistance under measurement
• C. W  
• D.  none of above