Diagonal of a rectangular solid is
A√(length² + breadth² + depth² )
B√(length² + breadth² )
C(length² + breadth² + depth² )
D(length + breadth + depth)
A√(length² + breadth² + depth² )
B√(length² + breadth² )
C(length² + breadth² + depth² )
D(length + breadth + depth)