Yesterday we organized Cloud Concepts and Technology & Services. Today we recap the remaining two domains: Domain 2 (Security & Compliance, 30%) and Domain 4 (Billing, Pricing & Support, 12%). Domain 2 is the second largest by weight, so it shows up often, and while Domain 4 is small, it packs together easily confused points like IAM and pricing tools.
This is the most important concept. It's split into "security of the cloud vs. security in the cloud."