The difference between a cash account and a margin account is:

a margin account allows the investor up to five days to pay for the entire purchase.

a cash account gives the investor a $2\%$ discount if they pay within $10$ days, or the investor has to pay the entire amount within $30$ days $(\frac{2}{10}$ net $30).$

a margin account allows the investor to borrow a percentage of the purchase price from the brokerage firm.

a margin account is less risky to the investor.

a cash account requires the stock be kept registered in street name, and a margin account allows the securities to be delivered to the customer.