Consider a triangular shaped pulse $x$ of base $2 T$ and unit height centered at $0$ , i.e. $x(t)=0$ for $|t|>T, x(t)=1-|t|$ for $t \in[-T, T]$. Then if $x$ is convolved with itself, the output is
- Square shape.
- Triangular shape.
- Bell shape.
- Inverted $\text{U}$ shape.
- None of the above.