Apple Certified Support Professional (ACSP) Practice Exam

For a successful macOS reinstallation, using the GUID partition table (GPT) is essential. GPT is part of the UEFI standard and is designed to support larger drives with more partitions compared to the older Master Boot Record (MBR) scheme. It allows macOS to utilize features such as disk encryption and recovery partitions which are crucial for system integrity and recovery.

In the context of modern macOS systems, the GPT allows for compatibility with Apple's EFI (Extensible Firmware Interface) system, making it the standard requirement for booting macOS on Intel-based Macs and Apple Silicon devices. Moreover, GPT facilitates the creation of multiple partitions that can be utilized for recovery and system operations without compromising drive performance or availability.

The other options do not align with the requirements of macOS installations. MBR, while still in use for certain older systems, does not support the advanced features that macOS utilizes. FAT32 is a file system rather than a partitioning scheme, making it unsuitable for macOS installations, and an unpartitioned disk would not have the structure necessary to install the operating system. Therefore, GPT is the correct choice for successfully partitioning a disk for a macOS reinstallation.