—Do you know__________________?  

—At the end of July?   [ ]

A. how soon is your sister coming back home      

B. how often Nancy hears from her pen friend  

C. when the London Olympic Games will be held  

D. when will the new computer game come out

假定一个超链从一个万维网文档链接到另一个万维网文档时，由于万维网文档上出现了差错而使得超链只想一个无效的计算机名字。这是浏览器将向用户报告什么？