3. Let D = {(x, y, z) | x² + y² ≤ 1, z = 0.} C R³ be the unit disk in the xy-plane. Is D a Jordan Domain in the xy-plane as a set in R²? Does D have Jordan content 0 as a set in R²? Is D a Jordan Domain in R³? (What is the boundary of D in R³?) Does D have Jordan content 0 as a set in R³? Justify your statements.

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