Z-transform of x[n] = cosπ n u[n] will be .3

z	(2z - 1)	, 0 < \|z\| < 1
2	(z² - z + 2)	, 0 < \|z\| < 1

z	(2z - 1)	\|z\| > 1
2	(z² - z + 2)	\|z\| > 1

z	(1 - 2z)	, 0 < \|z\| < 1
2	(z² - z + 2)	, 0 < \|z\| < 1

z	(1 - 2z)	\|z\| > 1
2	(z² - z + 2)	\|z\| > 1