When two species interact, they can benefit from the interaction (+), be harmed by the interaction (-), or not be affected (na). Which of the following species interactions is INCORRECTLY labeled?
A) mutualism: species 1 (+), species 2 (+)
B) predator/prey: species 1 (+), species 2 (-)
C) competition: species 1 (-), species 2 (-)
D) commensalism: species 1 (+), species 2 (na)
E) None; all of the above are correctly labeled.