Gaius Marius Established the Roman Army as a Professional, Long-Service

Gaius Marius established the Roman army as a professional, long-service corps with loyalty to the generals rather than the state by

A) Recruiting landless men who would owe their livelihood to their general
B) Placing soldiers on a payroll, making official the client-patron relationship between soldier and commander
C) Promising land to the soldiers after their term of service
D) All of these options are correct