Which of the following controls is implemented in lieu of the primary security controols

Idon understand these and need some ! ?

What machine listens for http requests to come in to a website’s domain? a. a router b. a browser c. a server d. a uniform resource locator

Helen's credit card has an apr of 15.32% and a grace period of 17 days and helen pays her balance in the full every month. if her last billing cycle ended on september 26, 2009, and she made her payment on october 11, 2009, did she owe any interest on her last statement's balance?