A predefined set of colors, fonts, and effects that can be applied as a single selection is a:

After a new RADIUS server is added to the network, an employee is unable to connect to the company's WPA2-Enterprise WIFI network, which is configured to prompt for the employee's network username and password. The employee reports receiving an error message after a brief connection attempt, but is never prompted for credentials. Which of the following issues could be causing the problem?

A. The employee's account is locked out in the directory service B. The new RADIUS server is overloading the wireless access point C. The new RADIUS server's certificate is not trusted by the employee's PC D. The employee's account is disabled in the RADIUS server's local database

In a binary tree,

A) there must be at most one node with no predecessor B) there may be at most two nodes with no predecessor C) there may be any number of nodes with no predecessor D) there must be exactly one node with no predecessor