What Is the BEST Way to Correlate Large Volumes of Disparate

What is the BEST way to correlate large volumes of disparate data sources in a Security Operations Center (SOC) environment?

A) Implement Intrusion Detection System (IDS)
B) Implement a Security Information and Event Management (SIEM) system
C) Hire a team of analysts to consolidate data and generate reports
D) Outsource the management of the SOC