Where should "back to top" on long FAQ page link to?

My FAQ page consists of a table of contents (with links jumping to each FAQ entry) and all FAQ entries. The entries are grouped in sections.

FAQ

ToC (#toc)

Section 1 (#toc-section-1)

  • QA 1 (#toc-qa-1)
  • QA 2 (#toc-qa-2)

Section 2 (#toc-section-2)

  • QA 3 (#toc-qa-3)
  • QA 4 (#toc-qa-4)

Section 1

QA 1

QA 2

Section 2

QA 3

QA 4

The page can get long: many sections, many FAQ entries. So after each FAQ entry, I’m providing a "back to top" hyperlink. Where should "back to top" link to?

When reading QA 3, should it link to #toc, #toc-section-2, or #toc-qa-3?

And if it should link to some other place than the top/ToC, should the label be something else than "back to top"?