Which of the following lines in the Apache configuration file would allow only clients with a valid certificate to access the website?

Which of the following lines in the Apache configuration file would allow only clients with a valid certificate to access the website?

A.
SSLCA conf/ca.crt

B.
AuthType ssl

C.
IfModule libexec/ssl.c

D.
SSLRequire

E.
SSLVerifyClient require