Which of the following statements is/are correct?1. A continuous-time system is a system in which, continuous-time input signals are applied, resulting in continuous-time output signals.2. A system is said to be linear if it follows the superposition theorem.3. A system is said to be non-linear if it follows the superposition theorem.

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