Please refer to the regression output below. At a 1% level of significance, how many significant variables do we have?

	Coefficients	Std. Error	t Stat	P-value	Lower 95%	Upper 95%
Intercept	101673.87	66200.55	1.54	0.14	-35997.71	239345.46
YEAR	-50.41	33.68	-1.50	0.15	-120.44	19.62
DISH	0.40	0.13	3.19	0.00	0.14	0.66
DISP	0.35	0.32	1.10	0.28	-0.31	1.00
RES	10.28	14.60	0.70	0.49	-20.07	40.64

Select one:

a.All variables are significant

b.There are no significant variables

c.There is one significant variable

d.There are three significant variables