A Deployment has 10 replicas and leaves maxSurge at its default. How many Pods above the desired count may exist during a rolling update?

Answer: C. 3

maxSurge also defaults to 25%, but a percentage there is rounded up rather than down, so 25% of 10 gives 3 — the opposite rounding to maxUnavailable.

Source: Deployments (Kubernetes) — Writing a Deployment Spec › Max Surge