How Do Researchers Obtain an ERP (Event-Related Potential) Reading

Multiple Choice

How do researchers obtain an ERP (event-related potential) reading?

A) They take EEGs of participants doing a task repeatedly, and then average those readings.
B) They take EEGs of participants doing different tasks and then take the average of those readings.
C) They take EEGs of participants doing a task repeatedly and only use readings that show brain activity above a certain threshold.
D) They take EEGs of participants doing a task repeatedly and only use readings that show brain activity in specific areas.