A graph of a function g shows that as x approaches 2 from either side, the y-values approach 3. The point (2,3) is an open circle, while the point (2,5) is filled in. Which type of discontinuity occurs at x=2?
a) Jump discontinuity
b) No discontinuity; the function is continuous at x=2
c) Removable discontinuity
d) Infinite (vertical asymptote) discontinuity