As we know that equivalent resistance of a capacitor for an AC circuit is given as

so here for an AC circuit capacitor will provide less resistance to AC component of the current
While for DC as we know it has ZERO frequency
so we will have large resistance
so here we will have to use capacitor as a filter circuit which will separate AC component of current from the DC current
So correct answer will be
CAPACITOR
Answer:
Zero angle is possible geometrically in a right triangle when its length of opposite side is equal to zero. Due to zero length of opposite side, the length of hypotenuse is absolutely equal to the length of hypotenuse.