Which ECS deployment should the company use to meet these requirements?

Explanations:

A rolling update gradually replaces old tasks with new ones, without controlling traffic percentages. It does not support initial partial traffic exposure or immediate full cutover.

Blue/green with canary allows setting a specific traffic split (like 10%) initially to the new version, and then enables shifting all traffic immediately when needed.

Blue/green with all at once shifts all traffic instantly to the new version, not allowing a 10% initial exposure.

Blue/green with linear increments traffic in fixed steps (e.g., 10% every few minutes), lacking immediate, full traffic cutover after an initial exposure.