Sara, a network administrator, downloads a Windows PowerShell script that can be used to delete user accounts. She tries to execute the script through Windows PowerShell. However, the script does not run. What do you think is preventing the script from running?

a. The computer was running on Windows XP.
b. The script was created using Notepad instead of an advanced editor.
c. The execution policy was set as Restricted.
d. The script was saved using the .ps1 file extension.