$6.$ Which of the following is not a common drawback of alternative investments?

O A Alternative investments are relatively illiquid and thus requires a liquidity premium

B$.$ Usually have low correlation with stocks and bonds and thus can be used as a portfolio diversifier

C$.$ Some alternative investments are subject to the so$-$called positive event risk where amiable economic events would cause their price to rise

OD$.$ High due diligence costs due to complex investment structures

OE Difficulty to appraise performance as benchmark is hard to establish for alternative$$investments