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Consider two $16$-point sequences $x\left [ n \right ]$ and $h\left [ n \right ]$. Let the linear convolution of  $x\left [ n \right ]$ and $h\left [ n \right ]$ be denoted by $y\left [ n \right ]$, while $z\left [ n \right ]$ denotes the $16$-point inverse discrete Fourier transform $\text{(IDFT)}$ of the product of the $16$-point $\text{DFTs}$ of $x\left [ n \right ]$ and $h\left [ n \right ]$. The value(s) of $k$ for which $z\left [ k \right ]=y\left [ k \right ]$ is/are

1. $k=0,1,2,,15$
2. $k=0$
3. $k=15$
4. $\text{k=0 and k=15}$