In Quantum Mechanics a Node (Nodal Surface or Plane) Is $\varPsi$

In quantum mechanics a node (nodal surface or plane) is ________ .

A) location where $\varPsi$ is negative
B) location where $\varPsi$ is positive
C) location where $\varPsi$ ² is positive
D) location where $\varPsi$ ² is negative
E) location where $\varPsi$ is zero