Programs that control and coordinate computer hardware are called ________ software

Which of the following statements is true?

a. Methods and instance variables can both be either public or private. b. Information hiding is achieved by restricting access to class members via keyword public. c. The private members of a class are directly accessible to the clients of a class. d. None of the above is true.

Which of the following is a valid XML tag?

a. b. c. d.