This file is indexed.

/usr/share/zentyal/stubs/dns/named.conf.options.mas is in zentyal-dns 2.3.3.

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The actual contents of the file can be viewed below.

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<%args>
  @forwarders
</%args>
options {
	directory "/var/cache/bind";

	// If there is a firewall between you and nameservers you want
	// to talk to, you might need to uncomment the query-source
	// directive below.  Previous versions of BIND always asked
	// questions using port 53, but BIND 8.1 and later use an unprivileged
	// port by default.

	//query-source address * port 53;
	//transfer-source * port 53;
	//notify-source * port 53;

	// If your ISP provided one or more IP addresses for stable 
	// nameservers, you probably want to use them as forwarders.  
% if ( @forwarders > 0 ) {
        forward first;
	forwarders {
%    foreach my $forwarder (@forwarders) {
             <% $forwarder %>;
%    }
	};
% }

	auth-nxdomain no;    # conform to RFC1035

	allow-query { any; };
	allow-recursion { trusted; };
	allow-query-cache { trusted; };
};