Suppose a knowledge base contains just one sentence x As High As (x, Everest). Which of the

Suppose a knowledge base contains just one sentence Эx As High As (x, Everest). Which of the following arc legitimate results of applying Existential Instantiation?

a. As High As (Everest, Everest).

b. As High As (Kilimanjaro, Everest).

c. As High As (Kilimanjaro, Everest) ^ As High As (Ben Nevis Everest) (after two applications).