The style rule ____ applies a 10-pixel margin above and below every h1 element, and a 20-pixel margin to the left and right

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The style rule ____ applies a 10-pixel margin above and below every h1 element, and a 20-pixel margin to the left and right.

		h1 {margin: 20px 20px;}
		h1 {margin: 20px 10px;}
		h2 {margin: 10px 20px;}
		h1 {margin: 10px 20px;}