Which of the following statements replaces the two characters located in subscripts 4 an...

Which of the following statements replaces the two characters located in subscripts 4 and 5 in a string variable named code with the string “AB”?

a. code.replace(2, 4, "AB");

b. code.replace(4, 2, "AB");

c. code.replace(4, 5, "AB");

d. replace(code, 4, "AB");