The Apache Group directive should be set correctly.
(1) group name
(1) Apache configuration file: Group directive
L1 8. User Oriented General Directives p14
1.6 Creating the Apache User and Group Accounts p14
CIS Apache Benchmark for Unix v1.7 For Apache Versions 1.3 and 2.0
CIS
2007-07-01
Version 1.7
Prose (PDF)
Security Configuration Benchmark For Apache Web Server
CIS
2008-11-01
Version 2.2.0
Prose (PDF)