Exercise 2: Switching From Uniform to Flexible Orchestration — Possible Solution
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VM Scale Set orchestration mode is a real, one-time decision made at
the moment the scale set is created, and it genuinely cannot be
changed afterward -- there is no in-place upgrade or configuration
toggle that converts an existing Uniform-mode scale set into a
Flexible-mode one.

Because the team's existing scale set was created in Uniform mode,
gaining access to Flexible mode's own real capabilities (mixing Spot
and on-demand instances together) isn't a matter of changing a
setting on that existing resource at all.

ANSWER: The team must create an entirely new scale set configured for
Flexible orchestration mode from the start, then migrate their
workload onto it -- there is no real way to convert the existing
Uniform-mode scale set in place. This is exactly the concrete,
practical consequence the chapter's own warn-box describes: choosing
the wrong mode at creation time means recreating the scale set
entirely to switch.

WHY THIS WORKS AS AN ANSWER
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This correctly states the real, concrete action required (create a
new scale set, migrate onto it) rather than describing the limitation
only in the abstract ("you can't change it"), and matches the
chapter's own explicit real consequence for this exact situation.