a) How many are there? If Malificent stole one, is this the one from Sleeping Beauty that puts everyone to sleep, or is this the apple that the ginger bread house witch had?
Regina actually tells Hansel&Gretel that the apple was stolen from her. We also know that she traded the dark curse for the sleeping curse with Maleficent. I believe Regina put the sleeping curse on the apple. Thus, only one sleeping curse.