Briefing Android Knowledge

What does the following code do?

What does the following code do?
dialog.getWindow().setFlags(LayoutParams.FLAG_BLUR_BEHIND,
LayoutParams.FLAG_BLUR_BEHIND);

A.
When dialog is displayed the activity behind it will be blurred.

B.
When dialog is displayed the activity behind it will be dimmed.

C.
Any EditText behind the dialog will be disabled.

D.
When the dialog is displayed, the edges of the dialog will be blurred.