Case-Based Critical Thinking Question Lu Maintains a Website for the Local

Case-Based Critical Thinking Question Lu maintains a website for the local bicycle coalition, a nonprofit organization that she works with. She wants to add video of a recent bike safety class to the site.
Lu wants to include an image that users see before they play the video. To do this, she uses __________. 

A) the poster attribute
B) the object element
C) the param element
D) the img element