Set-builder notation is often more versatile and efficient than listing a set in roster form. This versatility is illustrated with the following two sets. A equalsStartSet x font size decreased by 4 vertical line font size decreased by 4 x font size decreased by 4 is an element of font size decreased by 4 Upper N and x greater than 7 EndSet B equalsStartSet x font size decreased by 4 vertical line font size decreased by 4 x greater than 7 EndSet Answer parts a) through d) below. Question content area bottom Part 1 a) Write a description of set A and set B. Start with set A. Choose the correct answer below. A. Set A is the set of all numbers greater than 7. B. Set A is the set of all natural numbers less than 7. C. Set A is the set of all natural numbers greater than or equal to 7. D. Set A is the set of all natural numbers greater than 7. Part 2 Now determine the description of set B. Choose the correct answer below. A. Set B is the set of all numbers greater than or equal to 7. B. Set B is the set of all numbers greater than 7. C. Set B is the set of all numbers less than or equal to 7. D. Set B is the set of all numbers less than 7. Part 3 b) Explain the difference between set A and set B. Choose the correct answer below. (Hint: is 47 and one half is an element of Upper A ? Is 47 font size decreased by 1 one half is an element of Upper B ?) A. Set A contains only positive numbers. Set B contains other types of numbers including negative numbers. B. Set A contains on