The Figure above shows the graphs of five functions, distinguished by color. For every function, enter below the letter p if the graph may be that of a polynomial, and the letter n if it cannot be the graph of a polynomial. (Of course we assume that figure shows all the relevant aspects of the graph.)

: blue
: green
: purple (magenta)
: red
: yellow

Hint: Ask what graph's can't show polynomials, the others do show a polynomial.