Explanation
The http_access directive for Squid allows or denies access to the web resources based on defined access control lists (ACLs). The syntax of the http_access directive is:
http_access allow|deny [!]aclname ...
The directive takes one or more ACL names as arguments, separated by spaces. The first argument is either allow or deny, indicating the action to be taken if the ACLs match. The optional ! character before an ACL name negates the result of that ACL.
To allow users in the ACL named sales_net to only access the Internet at times specified in the time_acl named sales_time, the correct http_access directive is:
http_access allow sales_net sales_time
This directive means that if the client IP address matches the sales_net ACL and the request time matches the sales_time ACL, then the access is allowed. Otherwise, the access is denied or the next http_access directive is evaluated.

Explanation/Reference:
Reference: https://www.centos.org/docs/5/html/5.1/Deployment_Guide/s1-ip6tables.html

Explanation
The option for BIND that is required in the global options to disable recursive queries on the DNS server by default is recursion no;. This option tells the server not to provide recursive query behavior to any client, unless overridden by a view or a zone statement. Recursive queries are queries that the server will try to resolve by contacting other servers if it does not have the answer in its cache or zones. Disabling recursive queries can improve the security and performance of the server, especially if it is only meant to serve authoritative zones123 References:
BIND: Stop Recursion DNS Under Linux / UNIX - nixCraft
How to Disable External DNS Recursion in BIND? | DeviceTests
bind - How to Disable External DNS recursion? - Ask Ubuntu