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Which of the following are history variables?

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Which of the following are history variables?

(a) HISTISIZE

(b) HISTFILESIZE

(c) HISTORY

(d) HISTISIZE and HISTFILESIZE

This question was posed to me during a job interview.

I want to ask this question from Shell Offerings in division Customizing the Environment & More File Attributes of Unix

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Correct choice is (d) HISTISIZE and HISTFILESIZE

To explain I would say: The history list is maintained in memory. Bash uses two separate variables HISTSIZE and HISTFILESIZE for setting the size of the history list in memory and on disk. For example,

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