is analyzing its fixed and variable costs within its current relevant range. As its cost driver activity changes within the relevant$$ range, which of the following statements$$ is$/$are correct?

I.

As the cost driver level$$ increases, total fixed cost remains unchanged.

II$.$

As the cost driver level$$ increases, unit fixed cost increases.

III.

As the cost driver level$$ decreases, unit variable cost decreases.

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Part $1$

$1.$

$$I$,$ II$,$ and III are correct.

$2.$

II and III only are correct.

$3.$

I only is correct.

$4.$

I and II only are correct.