Which of the Following Is Not a Recommended Practice to Follow

Which of the following is not a recommended practice to follow when using a compound microscope?

A) when moving from a low power objective to a higher-powered objective ensure that the new objective does not hit the slide.
B) start initially with the high power objective in place
C) position the object being viewed in the center of the field
D) adjust the light level with the diaphragm
E) use the clips or clamps to secure the slide onto the stage