CASE MYF-1 You Know That the Windows 10 File Explorer Gives You

CASE MYF-1
You know that the Windows 10 File Explorer gives you a lot of power in managing and organizing your files. You decide to take some time to explore its features.
-You tried to change a file's name, but Windows 10 did not permit the change. This is most likely because ____.

A) the filename had a 4-character extension
B) the filename had more than 32 characters
C) the filename contained a colon
D) the filename began with a number