How is the western front in World War I best characterized?

Question

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A stagnant war fought from trenches, with neither side gaining or losing much ground in spite of huge casualties

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One of the most dynamic front lines of the twentieth century

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The first war front in history dominated by air power

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A mostly inactive front, along which both sides took a primarily defensive stance, resulting in relatively few casualties

Q. How is the western front in World War I best characterized?