If a client investor is holding a large number of listed shares on the ASX, intends to sell in three months' time and wishes to protect the value of the share portfolio, they may: Select one: O a. buy a futures contract based on the S&P/ASX. O b. sell a futures contract based on the S&P/ASX, Oc. write a put option based on the S&P/ASX. O d. buy a call option based on the S&P/ASX. Clear my choice