The graph of `y=\frac{x^2+2x+c}{x^2-4}`, where `c \in R`, will always have
- two vertical asymptotes and one horizontal asymptote.
- a vertical asymptote with equation `x=-2` and one horizontal asymptote with equation `y=1`.
- one horizontal asymptote with equation `y=1` and only one vertical asymptote with equation `x=2`.
- a horizontal asymptote with equation `y=1` and at least one vertical asymptote.