The vector function \(\vec A = \vec \nabla u\), where u (x, y) is a scalar function. Then \(\left| {\vec \Delta \times \vec A} \right|\) is

The vector function \(\vec A = \vec \nabla u\), where u (x, y) is a sc

1.	The vector function \(\vec A = \vec \nabla u\), where u (x, y) is a scalar function. Then \(\left\| {\vec \Delta \times \vec A} \right\|\) is
A.	-1
B.	0
C.	1
D.	∞
Answer» C. 1