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A program on machine $X$ attempts to open a $UDP$ connection to port $5376$ on a machine $Y$, and a $TCP$ connection to port $8632$ on machine $Z$. However, there are no applications listening at the corresponding ports on $Y$ and $Z$. An $ICMP$ Port Unreachable error will be generated by

1. $Y$ but not $Z$
2. $Z$ but not $Y$
3. Neither $Y$ nor $Z$
4. Both $Y$ and $Z$