Which of the following landline telemetry systems are available?1. Voltage telemetry systems2. Current telemetry systems3. Position telemetry systems4. Resistive telemetry systems

• A. 1, 2 and 3 only
• B. 1, 2 and 4 only
• C. 1, 3 and 4 only
• D. 2, 3 and 4 only