A technician must add a line into HKLM. Which of the following tools would BEST enable this ability?

REGEDIT (regedit.exe) provides a graphical interface to the Windows registry, allowing a technician to navigate the full registry hierarchy including HKEY_LOCAL_MACHINE, add new keys and string/DWORD/binary values, and modify or delete existing entries. It is the standard built-in tool for all direct registry editing tasks. No other listed tool provides write access to registry hive data.

MSCONFIG is the System Configuration utility used to manage boot options and startup programs, not a tool for editing raw registry keys.

RD (Remove Directory) is a command-line tool for deleting file system directories and has no interaction with the Windows registry.

REGSVR32 registers or unregisters COM DLL components by calling their DllRegisterServer function, which writes specific registry entries automatically - it cannot manually add arbitrary registry lines.