Question $2\mathrm{.}4.(1$ pt$)$ Briefly explain the meaning of k in the kNN algorithm. Could k be set to $1?$ What would be the prediction for the $7$NN algorithm with the majority vote where the $7$ neighbors belong to the following classes: class $2,$ class$1,$ class$3,$ class $2,$ class $1,$ class $2,$ class$3?($answer length limit: up to $3$ sentences$).$