Figure shows the terminals of a transistor in plastic package TO 18. Then

• A. terminals 1, 2, 3 are emitter, collector, base respectively
• B. terminals 1, 2, 3 are emitter, base, collector respectively
• C. terminals 1, 2, 3 are base, emitter collector, respectively
• D. terminals 1, 2, 3 are collector, emitter, base respectively