Correct Answer: (a) He formed the military order of Sikhs
Note: The 10th Guru and last prophet of Sikh, Guru Gobind Singh converted Sikhs into a military sect "Khalsa Panth". He called the whole Sikh community as "Khalsa". He ordered Sikhs that each Sikh should have the surname of Singh' (male) and 'Kaur (female) and have hold Kesh, Kangha, Kachha, Kripan and Kada.