If the hearer wants to identify which of two people is standing, which expression may foreground exclusion?

The Separating Pronoun (Ḍamīr al-Faṣl): Restriction, Emphasis and Predication

• Treating the bare report as invariably equally restrictive
• Zayd huwa al-qāʾim
• Is Zayd standing?
• The bare adjective qāʾim