When adding transparency styles, what is the difference between using the opacity property versus the background property with an rgba() value?

1.  Opacity specifies the level of transparency of the child elements. Background with an rgba() value applies transparency to the background color only.
2.  Opacity applies transparency to the background color only. Background with an rgba() value specifies the level of transparency of an element, as a whole, including its content.
3.  Opacity specifies the level of transparency of an element, including its content. Background with an rgba() value applies transparency to the background color only.
4.  Opacity applies transparency to the parent and child elements. Background with an rgba() value specifies the level of transparency of the parent element only.

Correct Answer:

•  Opacity specifies the level of transparency of an element, including its content. Background with an rgba() value applies transparency to the background color only.