option block
    option {
            [ source-ip number ; ]
            [ max-requests number ; ]
            [ exec-program-user string ; ]
            [ username-chars string ; ]
            [ log-dir string ; ]
            [ acct-dir string ; ]
    } ;
The option block defines the global options to be used by radiusd.
source-ip
max-requests
exec-program-user 
Exec-Program and Exec-Program-Wait. The effective
group id will be retrieved from the `/etc/passwd' entry
for the given user.
username-chars
log-dir
acct-dir 
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