A laptop owner, Ann, can no longer see web pages when she opens her browser, and she can only see her search bars and plug-ins. Which of the following is the MOST likely source of this issue?

While a lack of current antivirus software is a security risk, it doesn't directly cause browser display issues like toolbars obscuring web pages, although malware could be responsible for installing such toolbars.

A computer needing component upgrades would typically manifest as overall slow performance or inability to run certain applications, not specifically as browser display content being obscured by toolbars.

Many browser toolbars, often installed by potentially unwanted programs or adware, position themselves at the top or bottom of the browser window. If an excessive number of these toolbars are installed, they can reduce the visible area for web content to zero, giving the impression that web pages are not loading or cannot be seen.

Password complexity is a security measure for user accounts and has no direct bearing on how web content is displayed or obscured by browser toolbars.