Which of the following static EM fields is/are valid?
1
\(\vec E = xy\hat i + 2yz\hat j{\rm{\;}} + 3xz\hat k\)
2
\(\vec B = 5y\hat i + 2xz\hat j{\rm{\;}} + 3x\hat k\)
3
\(\vec E = 5x\hat i + 7{\rm{yz}}\hat j{\rm{\;}} + 10zy\hat k\)
4
\(\vec B = xz\hat i + 2yx\hat j{\rm{\;}} + 3xz\hat k\)