我国公有制的主体地位主要体现在（）①就全国而言，公有资产在社会总资产中占优势②公有资产在各个地方、各个产业必须占支配地位③在混合所有制经济中，公有制成分必须保持在50％以上④国有经济控制国民经济命脉，对经济发展起主导作用

A.①②

B.①④

C.②③

D.③④

An analyst does research about different types of funds. Which ofthe following is least likely to hold an in-kind creation and redemption process（）

A. Closed-end funds.

B. Grantor trusts.

C. Managed investment companies.