Which of the following statements about covariance and correlation is most accurate?

Question $13$ options:

A zero covariance suggests there is no linear relationship between the returns on two assets.

Covariance could be equal to correlation.

Covariance could be much higher than correlation.

All the other answers.

The covariance of a two$-$stock portfolio is equal to the correlation coefficient times the standard deviation of one stock's returns times the standard deviation of the other stock's returns.