This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to choose nail trimmers for your cat
Consider the guillotine trimmer.
Guillotine trimmers are trimmers that have a circular hole that you place the nail through. This is called the stationary ring.

Options are:
a). This is a special kind of trimmer, where the end is about an inch (2.5 cm) away from a nail and then spikes to the middle. They are faster and lower the nail count than guillotine trimmers, so you can pick the smallest one possible..
b). This ring clamps over the ring and prevents it from jerking out. Guillotine trimmers are particularly good if your cat likes to chew, but they are also great for models with pvc and lace trimmers..
c). When you squeeze the handle, a cutting blade appears from the bottom of the stationary ring and slides upwards to snip the nail. Hold the clippers with the top side facing you..
d). They are mounted on grippers or crutches. They hold the rib in place while you cut away the nail..
The answer is:
c).