Match the functions below with their level surfaces at height 3 in the table at the right. 1. f(x, y, z)=2x² - 3z 2. f(x, y, z)= 2y² + 3x 3. f(x, y, z)= 2z² + 3x 4. f(x, y, z)= 2y² - 3x A B

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