بسم الله الرحمن الرحيم
c) Al-Haseeb (the One who takes account; the Reckoner)
Al-Haseeb is the one who is Sufficient for all His Slaves. He is the one recompenses (i.e. rewards) with them with either good or bad (depending on which on which one they deserve).
The proof for this Name is as follows:
وَإِذَا حُيِّيتُم بِتَحِيَّةٍ فَحَيُّوا بِأَحْسَنَ مِنْهَا أَوْ رُدُّوهَا ۗ إِنَّ اللَّـهَ كَانَ عَلَىٰ كُلِّ شَيْءٍ حَسِيبًا
“When you are greeted with a greeting, greet in return with what is better than it, or (at least) return it equally. Certainly, Allah is Ever a Careful Account Taker of all things.” [Surah An-Nisaa (4) :86]