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Which one of the following field patterns represents a TEM wave travelling in the position $x$ direction?

1. $E= +8\hat{y,} \: H = -4\hat{z}$
2. $E= -2\hat{y,} H = -3\hat{z}$
3. $E= +2\hat{y,} H = +2\hat{y}$
4. $E= -3\hat{y,} H = +4\hat{z}$