Which of the following conditions must be satisfied for a transistor to be in saturation?1. Its collector to base junction should be under forward bias2. Its collector to base junction should be under reverse bias3. Its emitter to base junction should be under reverse bias4. Its emitter to base junction should be under forward biasWhich of the above conditions are correct?

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