Which option is not correct about the Lagrange rectangular element used in FEM?

Which option is not correct about the Lagrange rectangular element used in FEM? Correct Answer Third-order Lagrange element has fifteen nodes

In general a pth-order Lagrange rectangular element has n nodes with n= (p+1)2, where p=0,1,2 … For p=0, n=1. For p=1, n=22, =4. For p=2, n=32 =9. For p=3, n=42 =16.
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