Which of the following is the definition of portfolio investmentportfolio investment? a. purchase of more than 10 % of the shares of a company in another nationpurchase of more than 10% of the shares of a company in another nation. b. purchase of less than 10 % of the shares of ownership in a company in another nationpurchase of less than 10% of the shares of ownership in a company in another nation. c. making loans to or buying bonds from a company in another nation. d. providing management services or consulting advice to a company in another nation.