Every distinct wording since 2010, newest first.
July 12, 2019 · Core Set 2020
Activated and triggered abilities on the stack aren’t spells, and therefore can’t be countered by anything that counters only spells. Activated and triggered abilities on the stack can be countered by effects that specifically counter abilities. Static abilities don’t use the stack and thus can’t be countered at all.
February 1, 2010 · Worldwake
Spells and abilities can affect objects and players they don't target. In general, those objects and players aren't chosen until the spell or ability resolves. See rule 608, "Resolving Spells and Abilities."