The correct answer is B. diskmgmt.msc , which opens the Disk Management console in Windows. Disk Management is the primary built-in tool used to create, delete, resize, and format disk partitions.

The Quentin Docter – CompTIA A+ Complete Study Guide explains that disk partitioning is commonly used to separate data for organizational, security, and backup purposes. Disk Management allows technicians to divide a single physical drive into multiple logical volumes, such as one partition for the operating system and another for user data.

The Travis Everett & Andrew Hutz – All-in-One Exam Guide states that diskmgmt.msc provides a graphical interface for managing partitions, drive letters, file systems, and volumes without requiring third-party tools. This makes it the preferred and safest option for partitioning tasks on Windows systems.

The Mike Meyers / Mark Soper Lab Manual clarifies that tools like perfmon.msc monitor performance, lusrmgr.msc manages user accounts, and devmgmt.msc handles hardware devices. None of these tools can modify disk partitions.

Because the task specifically involves creating partitions , Disk Management is the correct and only appropriate tool, making B the correct answer.