What's the Difference Between Foreign Direct Investment and Foreign Portfolio

What's the difference between foreign direct investment and foreign portfolio investment?

A) Foreign direct investment involves purchases of foreign stock or bonds by individuals or firms,while foreign portfolio investment involves a firm purchasing or building a facility in a foreign country.
B) Individuals engage in foreign portfolio investment,but only firms can engage in foreign direct investment.
C) Foreign direct investment only takes place when governments make official purchases or foreign investments,while foreign portfolio investment takes place when firms,individuals,or the government purchase foreign investments.
D) Foreign direct investment can give a low-income country access to funds and technology it would not otherwise have,but foreign portfolio investment does not expand that access.