组合ETF

嗨，从没放弃的小努力你好：

同学你好，这个题目没问题哈。根据原版书

A signifcant advantage of the ETF creation/redemption process is that the AP
absorbs all costs of transacting the securities for the fund’s portfolio. APs pass these
costs to investors in the ETF’s bid–ask spread, incurred by ETF buyers and sellers
c选项并不是proportional by existing ETF holder，请知悉

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虽然现在很辛苦，但努力过的感觉真的很好，加油！