Which of the following accurately reflects the concept of buying stock on margin?

a$.$

It is an example of financial leverage and means buying stock with borrowed funds.

b$.$

It is an example of financial leverage and requires leaving the stock with the broker.

c$.$

It is buying stock with borrowed funds and requires leaving the stock with the broker.

d$.$

It is an example of financial leverage, means buying stock with borrowed funds, and requires leaving the stock with the broker.