How is an investment bank different from a commercial bank

My answer -
Commercial banks borrow and lend money that they hold on their balance sheets.
They hold depositors' money in instruments such as savings accounts and CDs.They earn profits based on the difference in the interest rate at which they charge borrowers and the interest rate at which they give depositors.
Investment banks match institutions who want to borrow money to institutions who want to lend money. However, unlike commercial banks, investment banks simply intermediate these transactions and don't hold much capital themselves.
These transactions can be in the form of debt or equity, whereas commercial banks generally only deal with debt.Investment banks are compensated on a transaction-basis rather than an interest spread.

P.S

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The answer would be choice b