What is the investment amount that is required for a South African business visa application?

In order to qualify for a South African business visa, the foreigner must submit proof stating that they wish to invest a minimum amount of (a) ZAR 2.5 million in cash in foreign currency, (b), a capital contribution of at least ZAR 2.5 million or (c) at least ZAR 2.5 million in cash in foreign currency and a capital contribution of ZAR 500,000 into the book value of the business in question.