Which graph shows a polynomial function of an even degree?

The definition of a even function is:
 A function is even if, for each x in the domain of f, f (- x) = f (x).
 The even functions have reflective symmetry through the y-axis.
 We have then that the graph that meets this definition is:
 graph 1 (from left to right)
 
 graph 1 (from left to right)

Number 5 is 50 degreesnumber 6 is 45 degreesnumber 7 is 60 degreesnumber 8 is 45 degrees