Which symbol and unit of measurement are used for voltage?

a symbol: v; unit: a
b symbol: r; unit :
c symbol: v; unit: v
d symbol: r; unit: v

While looking at ads on a professional job site, justin saw this job posting: "the employee should have a degree in human behavior and at least 5 years experience in behavioral modifications. we are also looking for an employee who is good at crisis divergence. typically employees will spend a lot of time supporting others."