Consider the following statements regarding antibiotics–1. They are used to destroy disease-causing bacteria.2. They can be applied to the skin, swallowed or injected to fight micro-organisms inside the body.3. They are effective against disease-causing viruses.4. The first antibiotic to be discovered was tetracycline.Which of the statements given above is/are correct ?

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