What is an oblique plane?

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An oblique plane is any plane that cuts the body at an angle, not parallel to the three standard anatomical planes. The standard planes are sagittal (dividing left from right), coronal (dividing front from back), and transverse (dividing top from bottom). An oblique plane passes through the body diagonally, so it isn’t aligned with any of those planes. That’s why the statement describing it as an angled plane that cuts across at an oblique angle, not parallel to the standard planes, is the best fit. The other ideas describe planes that align with one of the standard planes or that specifically separate left and right portions, which would be standard planes rather than oblique.