$($a$)$ List the three $(3)$ elements of a classification tree and two $(2)$ possible stopping criteria $(5$ marks$)$

$($b$)$ Given the following decision tree, show how the new examples in the table would be classified by filling in the last column in the table. If an example cannot be classified, enter UNKNOWN in the last column.$)(5$ marks$)$

$\backslash$table$[[$Example$,$Color,Helght,Width,Clase$],[$A$,$Rod,Shon,Thin,$],[$B$,$Blue,Tall,Fal,$],[$C$,$Green,Short,Fat,$],[$D$,$Green,Tall,Thin,$],[$E$,$Blue,Short,Thin,$]]$

$($c$)$ Use the set of rules below to build a decision tree that represents its path. $(5$ marks$)$

IF colour $=$ blue THEN YES

IF colour $=$ red AND shape $=$ circle THEN YES

IF colour $=$ red AND shape $=$ square THEN NO

IF colour $=$ red AND shape $=$ triangle THEN NO