Read the following statements about sets 1.If A and B are sets then A + B denotes union of sets A and B. 2.The union of A and B is that set whose elements are in either A or B or both. 3.If A and B are sets, then difference of sets A and B is denoted by A - B. 4.A - B in the set obtained by removing elements of A from B. Which of the above are true?

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