A voltmeter (with an internal resistance less than innity) is connected to the system; the voltmeter contact points (P1 and P2 with the same :1: coordinate) are in the same vertical plane. Identify the case where the sign of the charge of current carriers are either negative (electrons) or positive (holes). 1. The direction of the current through the voltmeter is downward for positive charge car- riers and upward for negative charge carri- ers. 2. The direction of the current through the voltmeter is downward for either positive or negative charge carriers. 3. The current through the voltmeter is zero for either positive or negative charge carri- ers. 4. The direction of the current through the voltmeter is upward for either positive or neg- ative charge carriers. 5. The direction of the current through the voltmeter is upward for positive charge carri- ers and downward for negative charge carri- ers. B P1 O O B O O O O O O O O O V P2 L