Which is the correct syntax for adding alternate text for image, if the image cannot be displayed?

A. <img src = "boat.gif" alt = "big boat"/>

B. <img src = "boat.gif" alt text = "big boat"/>

C. <img src = "boat.gif" alternate = "big boat"/>

D. <img src = "boat.gif" alternate text = "big boat"/>

Correct Answer: <img src = "boat.gif" alt = "big boat"/>