In WPF/XAML, when Margin is specified with two numbers like Margin='5,5', the syntax is 'Left, Top' and the Right and Bottom default to the same values. So Margin='5,5' means Left=5, Top=5, Right=5, Bottom=5. This is shorthand for uniform margin on all sides. Option C correctly identifies this uniform application. Options A and B incorrectly assume some margins would be zero.