问题如下：
Tactical asset allocation is best described as:
选项：
A.attempts to exploit arbitrage possibilities among asset classes.
B.the decision to deliberately deviate from the policy portfolio.
C.selecting asset classes with the desired exposures to sources of systematic risk in an investment portfolio.
解释：
B is correct.
Tactical asset allocation allows actual asset allocation to deviate from that of the strategic asset allocation (policy portfolio) of the IPS. Tactical asset allocation attempts to take advantage of temporary dislocations from the market conditions and assumptions that drove the policy portfolio decision.
A到底错在哪...TAA不也是对大类资产类别的分配吗
