Which of the following is true? Group of answer choices According to Knickerbocker's theory, when a firm has valuable know-how that cannot be adequately protected by a licensing contract, it engages in FDI. According to Knickerbocker's theory, when a firm's skills and know-how are not amenable to licensing, it usually prefers the FDI route. According to Knickerbocker's theory, by placing tariffs on imported goods, governments indirectly increase the cost of exporting relative to foreign direct investment and licensing. According to Knickerbocker's theory, when a firm that is part of an oligopolistic industry expands into a foreign market, other firms in the industry will be compelled to make similar investments