Let $X=S^1\vee S^1$ be a graph with one vertex and two directed edges $a,b$. We know by the Seifert--van Kampen theorem that $\pi_1(X)=\langle a,b\rangle$.

Which of the following covering spaces is the connected covering space of $X$ corresponding to the subgroup $\langle a^3,b^2,aba^2b,a^2bab\rangle\lhd\pi_1(X)$?