Help! which one?!

8. All of the following are types of foreign direct investment (FDI) except _____.

a foreign company merges with an existing firm in a less developed country (LDC)
a foreign company takes over a firm in an LDC
a foreign company enters into a partnership with a firm in an LDC
a foreign company buys stock in a firm in an LDC and helps the company build a new plant