A |x₂ - x₁| + |y₂ - y₁|
B (x₁+x₂)/2, (y₁+y₂)/2
C √(x₂ - x₁)² - (y₂ - y₁)²
D √(x₂ - x₁)² + (y₂ - y₁)²
Correct Answer: Option D
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