An investment policy statement is important to the portfolio management process because it:（）

A. specifies allocations across assets and countries.

B. provides a clear understanding of the level of risk a client is willing to accept.

C. creates a record of the benchmark against which performance will be judged.

若有一个动态数组a有两个元素a(0)和a(1)，现要令数组a有三个元素a(0)、a(1)和a(2)，则应当使用 【9】 语句。