Which two statements about stateless firewalls are true?

Which two statements about stateless firewalls are true? (Choose two.)
A. They compare the 5-tuple of each incoming packet against configurable rules.
B. They cannot track connections.
C. They are designed to work most efficiently with stateless protocols such as HTTP or HTTPS.
D. Cisco IOS cannot implement them because the platform is stateful by nature.
E. The Cisco ASA is implicitly stateless because it blocks all traffic by default.