answer plis

Mark Sims is exploring the characteristics of stock market investors. He found that sixty per cent of all investors have a net worth exceeding $1,000,000; 20% of all investors use an online brokerage; and 10% of all investors a have net worth exceeding $1,000,000 and use an online brokerage. An investor is selected randomly, and E is the event 'net worth exceeds $1,000,000', and O is the event 'uses an online brokerage" Which of the following is true? Select one: O a. E and O are mutually exclusive O b, E and O are dependent O c. E and O are collectively exhaustive O d. E and O are independent