Consider following data:

x = {[1 1 2 2 3 3], [1 2 2 3 3 4]}, y = {[0 0 1 1 2 2]}

What is ply=1| x=(2,1]) using a 3-nearest neighbor classifier when using euclidean distance?
a. 2/3
b. 1/3
c. 0.5
d. 1