Which directives in httpd.conf need to be adjusted?

A web server is expected to handle approximately 200 simultaneous requests during normal use with an occasional spike in activity and is performing slowly. Which directives in httpd.conf need to be adjusted?

A.
MinSpareServers & MaxSpareServers.

B.
MinSpareServers, MaxSpareServers, StartServers & MaxClients.

C.
MinServers, MaxServers & MaxClients.

D.
MinSpareServers, MaxSpareServers, StartServers, MaxClients & KeepAlive.