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yes, when the month is written non-numerically (and the year is written with four digits) there is no ambiguity.

but, the three formats in OP's post are all about writing things numerically.

In some contexts, writing out the full month name can be clearer (at least for speakers of the language you're writing in), but it takes more (and a variable amount of) space and the strings cannot be sorted without first parsing them into date objects.

Anywhere you want or need to write a date numerically, ISO-8601 is obviously much better and should always be used (except in the many cases where the stupid formats are required by custom or law).