Alacrity couriers uses advanced information technology to run its business efficiently. it allows its customers to track their consignments on its website. in this scenario, the use of a(n) enables the customers to check on the status of their consignments.

Extranet

Explanation:

Extranet is referred to as or known as the privately controlled network which  allows the access to the partners, suppliers and vendors or the authorized set of consumers or customers that are normally subjected to the subset of information that is accessible from the organization's intranet. The extranet is mostly similar to the DMZ under which it tends to provide access to the services for the authorized parties, without further granting the access to the company's entire network.

yes, since there is a positive and a negetive if the positive and negitive wasn't there wouldn't a flow electricity in it.

the answer is either c or d i think its d