Exercise 2: Counting the Posts Behind a Variable Product — Possible Solution
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THE COUNT: FIVE POSTS
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Per this chapter, a Variable product with 4 total variations exists
in wp_posts as 5 separate posts: 1 parent post of type "product"
(holding the shared title, description, images, and the attribute
definitions themselves), plus 4 child posts of type
"product_variation" - one per variation, regardless of how many
attributes combine to define each one.

WHY THE NUMBER OF ATTRIBUTES DOESN'T CHANGE THE POST COUNT
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Per this chapter, each variation is one post, no matter how many
attributes (Size, Color, or more) combine to define that particular
combination. Two attributes producing 4 total variations still means
4 product_variation posts - the attribute count determines how many
combinations are possible, but the post count tracks the number of
variations actually created, not the number of attributes.

HOW THE CHILD POSTS RELATE TO THE PARENT
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Per this chapter, each of the 4 product_variation posts has its own
post_parent field pointing back to the single parent product post's
ID - the same parent/child relationship WordPress core already uses
elsewhere (e.g. a Page's own sub-pages), reused by WooCommerce rather
than invented specifically for variations.

WHY THIS WORKS AS AN ANSWER
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It gives the correct total (5: 1 parent + 4 children), correctly
identifies both post types involved, and correctly explains that the
attribute count and the variation/post count are two different
numbers, tying the relationship back to this chapter's own
post_parent explanation.