Exercise 2: Zones vs. Classes — Possible Solution
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WHAT A SHIPPING ZONE CONTROLS
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Per this chapter's own two-question framing, a shipping zone answers
"Where is this customer, and which method list applies?" - it matches
a customer's country, state, or postcode to a specific ordered set of
shipping methods (Flat rate, Free shipping, Local pickup, etc.).

WHAT A SHIPPING CLASS CONTROLS
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Per this chapter, a shipping class answers "Within that method, does
this particular product cost more or less to ship?" - it lets a
single method, like Flat Rate, charge a different amount for
different kinds of products (e.g. "Heavy" vs. the default "Standard"
class), all within the very same zone.

THE RELATIONSHIP BETWEEN THEM
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Per this chapter, zones and classes operate at two different levels
of the same decision: the zone narrows things down to "which region
is this order shipping to, and which methods are even available,"
and the class then further adjusts the cost of a chosen method based
on what specific product is being shipped - not a competing or
overlapping mechanism, but two different questions applied in
sequence.

WHY THIS WORKS AS AN ANSWER
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It correctly restates each mechanism's own distinct question exactly
as this chapter frames them, and correctly clarifies that they answer
different questions rather than duplicating each other.