Research into the Use of GPS Technology to Monitor High-Risk

Research into the use of GPS technology to monitor high-risk sex offenders found that

A) GPS monitoring is more expensive but also more effective than traditional parole supervision.
B) GPS monitoring is more expensive and less effective than traditional parole supervision.
C) GPS monitoring is less expensive and more effective than traditional parole supervision.
D) although GPS monitoring is more expensive than traditional parole supervision, there is no difference in the effectiveness of the two methods.