Which of the following statements are correct with regard to Sikhism?

(a) From the 1750s onwards the Sikh dals and misals (groups) became more and more powerful, led by individual chiefs (sardars) who organized troops of increasingly professional mounted musketeers.

(b) There was the tradition of an annual 'Sarbat Khalsa' at Chak Guru (Amritsar); but because of dissensions each chief tended to carve out a separate territory for himself.

(c) The process was at last checked by Ranjit Singh (1780–1839), who established a kingdom in the Punjab in the name of the Khalsa.

(d) The Gurus were all Khatris, but their principal lieutenants, the Masand were mostly Jatts in the seventeenth century.

Choose the correct answer from the options given below: