Which of the following individuals is known for his Tesla and SpaceX companies?

Opponents of electronic voting, fearing that every vote on a single machine may be lost to computer error or malfunction, urge the use of ballots that leave a so-called __________ trail

Fill in the blank with the right word.

The Chicago political machine

a. has been controlled by Italian immigrants. b. came to power in 1900. c. focused on maintaining the quality of the central business district. d. worked on improving the living conditions in poorer black neighborhoods.