Which of the following @viewport Property locks the document in the specified orientation, portrait or landscape?

The correct answer is: A. orientation

The orientation property locks the document in the specified orientation, portrait or landscape.

The resolution property specifies the resolution of the viewport, in pixels per inch (ppi).

The landscape property specifies that the viewport should be in landscape orientation.

The portrait property specifies that the viewport should be in portrait orientation.

Here is an example of how to use the orientation property:

css
@viewport {
orientation: portrait;
}

This will lock the viewport in portrait orientation.