Two similar triangles below are shown on the coordinate grid:

(Look at pic)

Which set of transformations has been performed on triangle PQR to form triangle P′Q′R′?

Dilation by a scale factor of fraction 1 over 2 followed by reflection across the x-axis
Dilation by a scale factor of 2 followed by reflection across the x-axis
Dilation by a scale factor of fraction 1 over 2 followed by reflection across the y-axis
Dilation by a scale factor of 2 followed by reflection across the y-axis