A daily standup Scrum meeting is BEST accomplished in a:

Telephone conferences lack visual cues and non-verbal communication that help teams detect blockers and engagement issues quickly.

Group email is asynchronous and does not constitute a meeting, violating the real-time, time-boxed nature of a daily standup.

The Agile Manifesto explicitly states that face-to-face conversation is the most efficient and effective method of conveying information within a development team. Scrum standups rely on quick verbal and non-verbal cues, immediate clarification, and team cohesion that in-person meetings uniquely support. All other formats introduce latency or reduce the richness of communication.

Video conferencing is superior to phone or email but still introduces technical friction and lacks the immediacy and presence of face-to-face interaction.