Identify the Letter of the Choice That Best Matches the Phrase

Multiple Choice

Identify the letter of the choice that best matches the phrase or definition.
-It acts as a fallback option for browsers that do not support the HTML5 multimedia elements by adding the embed element.

A) Container
B) source element
C) autoplay
D) WAV
E) Plug-in
F) H.264
G) flashvar
H) captions
I) poster
J) muted