Answer: B – PowerShell is a windows tool commonly used for systems administration by making use of cmdlets and scripts. PowerShell can be installed to previous versions of Windows. In Windows 8/8.1, PowerShell is integrated.
iTerm2 is a terminal editor for Mac OS (successor of iTerm). PuTTy is a free SSH and Telnet client. CMD is a windows tool similar to PowerShell but not as powerful as the PowerShell.