You are given two training samples: x$1$ from $1$ and x$2$ from $2.$ Also, we know x$1<$ x$2.$ Find the nearest$-$neighbor $($NN$)$ decision rule for classifying any new data point x$.$ What is the probability of error for this NN classifier? $($Note: for this Part $($b$),$ you are given a fixed training set, i$.$e$.,$ you view x$1$ and x$2$ as some given, fixed values.$)$