Use the image to answer the question.
Triangle upper X upper Y upper Z and a dotted line are graphed on a coordinate plane. The x- and y-axes range from negative 7 to 7 in increments of 1. The dotted line is labeled axis of reflection and follows y equals 1.
What are the coordinates of Y′ after a reflection across y=1?
(1 point)
Responses
Y′(4,−1)
upper Y prime left parenthesis 4 comma negative 1 right parenthesis
Y′(4,5)
upper Y prime left parenthesis 4 comma 5 right parenthesis
Y′(−2,−1)
upper Y prime left parenthesis negative 2 comma negative 1 right parenthesis
Y′(−2,3)