the first option. Education
Olayinka Herbert Samuel Heelas Badmus Macaulay (14 November 1864 – 7 May 1946) was a Nigerian nationalist, politician, surveyor, engineer, architect, journalist, and musician and is considered by many Nigerians as the founder of Nigerian nationalism.
Because once an indentured servants time is up, you have to let them live their own life, but if you have a slave, you literally own them and keep them until they die if you choose to do so.