Which of the following is the primary difference between SCARF and CIS?

a. CIS is unable to collect data to be used for performance monitoring purposes, whereas SCARF can be used to collect evidence to judge the host application system's efficiency

b. CIS is invoked by the database management system to collect the required audit evidence, whereas SCARF can be invoked by a call from any point in the host application system

c. CIS uses generalized reporting facilities, whereas SCARF uses specialized reporting facilities

d. Only tagged transactions can be examined using CIS, whereas SCARF can also be used to collect statistical samples of input transactions