Select all transformations that maintain a shape's congruency.


A: a translation six units up

B: a reflection across the x-axis

C: a 180° rotation about the origin

D: a dilation with a scale factor of 2

E: a reflection across the y-axis and then a translation three units left

F: a translation two units down and then a dilation with a scale factor of less than 1

G: a reflection across the y-axis and then a dilation with a scale factor greater than 1