The Daily Scrum is an event that happens every day.

According to the Scrum Guide1, the Daily Scrum is an event for the Developers of the Scrum Team. The purpose of the Daily Scrum is to inspect progress toward the Sprint Goal and adapt the Sprint Backlog as necessary, adjusting the upcoming planned work. The Daily Scrum optimizes the probability that the Developers will meet the Sprint Goal. Every day, the Developers should understand how they intend to work together as a self-organizing team to accomplish the Sprint Goal and create the anticipated Increment by the end of the Sprint. If the frequency of the Daily Scrum were to be lowered to every two or three days, some key concerns would be:

Opportunities to inspect and adapt the Sprint Backlog are lost, which may result in wasted work or missed dependencies.

Impediments are raised and resolved more slowly, which may hinder the progress and quality of the work.

The Sprint plan may become inaccurate, as changes in requirements, risks, or priorities are not reflected in a timely manner.

The other options are not valid concerns, as they are not aligned with Scrum values and principles.

References: Scrum Guide