أَءِذَا كُنَّا عِظَـٰمًا نَّخِرَةً ۝١١ What is the relation of نَّخِرَةً to عِظَـٰمًا?

Surah An-Nazi'at — Part 2

• It is the subject of كُنَّا
• It is an accusative adjective agreeing with it
• It is a genitive annex
• It is an adverb of time