According to the graph of H(w) below, the line w = 0 is also the _vertical asymptote_ for H(w). (Option D: Vertical asymptote).
Suppose that we have the function f(x) such that it is continuous for all input values < a or > a and have got the values of f(x) going to infinity or -ve infinity (from either side of x = a) as x goes near a , and being not defined at x = a, then at that point, there can be constructed a vertical line x = a and it will be called as vertical asymptote for f(x) at x = a
For this case, the graph is approaching the verital line x = 0.
Assuming it goes infinitely closer to the line x = 0 but never touches it, and other conditions for x= 0 being an asymptote meets, the line x=0 serves as vertical asymptote to the considered function's graph.
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