Question

What formal condition defines the behavior of the undo feature?

a.

doit(e, c ^ undo) = e

b.

doit(e, undo ^ undo) = e

c.

doit(e, x ^ undo) = e

d.

doit(ex, undo) = e

Posted under Human Computer Interaction

Answer: (a).doit(e, c ^ undo) = e Explanation:The formal condition that defines the behavior of the undo feature is given by the equation: doit(e, c ^ undo) = e. This equation ensures that applying a command followed by the undo command restores the system's state to its previous state.

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