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

How to make aloe vera juice
Gather the ingredients.
You will need :
Aloe barbadensis miller plant 1 tablespoons (15ml) of white vinegar (optional) 1 cup (8 oz) water (optional) 1 cup (8 oz) of any citrus based juice.
Break off a few leaves from an aloe barbadensis miller plant.

OPT: + Take the leaves and place them in a small container. These will make the concentrate for this mixture.; + If you want to grow a similar aloe vera plant, it may work best to separate several of the leaves. Cut the cut leaves and stems into 1/4-inch (6 mm) chunks.; + Take a sharp knife and carefully peel the rind from the plant leaves and discard. Peel the yellow layer just beneath the rind with a sharp knife and discard.; + Aloe barbadensis miller plants have 2 leaves while many varieties have 3. Aloe barbadensis miller plant 7 leaves Wash and slice the aloe barbadensis miller plant.;
The answer is:
Take a sharp knife and carefully peel the rind from the plant leaves and discard. Peel the yellow layer just beneath the rind with a sharp knife and discard.