The six books of sound AHadits are known as
Asmaur-rijal
sahihayn
Sihahus-sittah
suhf
Correct answer is C
The six books of sound AHadith are known as sihahus_sittah. The Kutub al-Sittah are the six (originally five) books containing collections of hadith (sayings or acts of the prophet).