X is a length of wire with length $l$, cross-sectional area $a$ and resistance $R$. Wire Y is constructed from the same material and is joined to wire X so that the combined component has a total resistance of $\frac{R}{2}$. What are the dimensions of Y, and in what way is it connected to X?
- Alength $2l$, area $0.25a$, in parallel
- Blength $2l$, area $0.25a$, in series
- Clength $4l$, area $4a$, in parallel
- Dlength $4l$, area $4a$, in series