Question on polarization of light

The state of polarization of light with electric field vector
\bar{E}=\hat{i}E_0cos(kz-\omega t)-\hat{j}E_0cos(kz-\omega t) is
a)linearly polarized along Z axis
b)linearly polarized at 45° to X axis
c)circularly polarized
d)elliptically polarized with major axis along X-axis

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