The equation of the graph shown here is...

The equation of the graph shown here is

A

when x `le `0, y=+1
when x `gt` 0, y=-1

B

when `x lt 0, y=+1 `
when `x ge 0, y=-1 `

C

when `x lt 0, y=+1`
when `x gt 0, y=-1 `

D

when `x lt 0, y=-1`
when `x gt 0, y = +1`

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