Which one of the following field patterns represents a TEM wave traveling in the positive 'x' direction?

• A. E = +8ŷ, H = -4ẑ
• B. E = -2ŷ, H = -3ẑ
• C. E = +2ẑ, H = +2ŷ
• D. E = -3ŷ, H = +4ẑ