(a)
-DHARD_SERVER_LIMIT=256
-DDYNAMIC_MODULE_LIMIT=0
-DBUFFERED_LOGS

(b)
MinSpareServers        256
StartServers           256
MaxSpareServers        256
MaxClients             256

MaxRequestsPerChild    1000
KeepAlive              on
KeepAliveTimeout       15
MaxKeepAliveRequests   64
Timeout                400
IdentityCheck          off
HostnameLookups        off
<Files ~ "\.(html|cg)$>
HostnameLookups on
</Files>
<Directory />
Options FollowSymLinks
AllowOverride None
</Directory>