Consider the following circuit configuration 1. common Emitter2. common Base3. emitter follower4. emitter follower using Darlington pair. The correct sequence in increasing order of I/P impedance of these configuration:

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