Which of the following are the basic elements in a 555 timer IC?(a) Two comparators(b) A flip-flop(c) A discharge transistor(d) A resistive voltage divider

• A. (a), (b) and (d)
• B. only (a), (b) and (c)
• C. only (b), (c) and (d)
• D. only (a), (b), (c) and (d)