You have used your computer for several months without any issues. Recently, you have noticed that when you perform speicific actions or open certain files, your computer rashes, and programs sometimes freeze. You suspect that hard disk issues are the cause. Which of the following tools would best verify and fix disk errors?

- format
- Bootrec. exe
- chkdsk
- Diskpart

Which of the following statements is false? a. a class can directly inherit from class object. b. if the class you're inheriting from declares instance variables as private, the inherited class can access those instance variables directly. c. a class's instance variables are normally declared private to enforce good software engineering. d. it's often much more efficient to create a class by inheriting from a similar class than to create the class by writing every line of code the new class requires.