An analyst does research about correlations and gathered information about three economic variables. He noted that whenever variable X increased by one unit, variable Y increased by 0.5 units but variable Z decreased by 0.5 units. The correlation between variables X and Y and the correlation between-variables X and Z, respectively, are closest to:()

A.A

B.B

C.C

套期保值是以______为目的的期货交易行为。

A．收益最大化
B．风险最小化
C．规避现货风险
D．获取远期收益