What is index based/passive investing? (select all that apply) Select 3 correct answer(s) a) buy-and-hold portfolio strategy for long-term investment horizons, with minimal trading in the market. b) a sufficiently diversified investment portfolio, where assets that are strong at any given time can help offset losses in those that may be losing value. c) investing directly into an index. d) typically provides greater protection against market risk than owning a limited number of stocks or other securities