Give one reason why the description of the Qutb-ud-din Aibak’s dynasty as a “slave dynasty” is regarded as inaccurate

Q. Give one reason why the description of the Qutb-ud-din Aibak’s dynasty as a “slave dynasty” is regarded as inaccurate.

(a) Because except for Qutb-ud-din Aibak. Others rulers of the dynasty were not slaves

(b) Because only three kings of this dynasty were slaves and even these three were manumitted by their masters

(c) Because technically only Qutb-ud-din Aibak started his career as a slave and he too was manumitted upon obtaining a letter of investiture from the Abbasid Caliph

(d) Because all the rulers of this dynasty did not belong to one family

Ans: (b) Because only three kings of this dynasty were slaves and even these three were manumitted by their masters