Final answer:
The valid partitioning types from the choices provided are (b) MBR and (c) GPT. MBR is an older partitioning scheme with a 2TB size limit, while GPT is a newer standard that is part of UEFI and does not have the same size restrictions.
Step-by-step explanation:
When considering Which of the following are valid partitioning types?, the correct options are (b) MBR and (c) GPT. MBR stands for Master Boot Record, and it's a traditional partitioning scheme used for hard drives. It supports up to four primary partitions, or three primary partitions and one extended partition that can contain multiple logical partitions. However, MBR has a size limit of 2TB for the maximum size of a partition. On the other hand, GPT stands for GUID Partition Table, which is a more modern standard that is part of the UEFI (Unified Extensible Firmware Interface) specification, which replaces the older BIOS.
Option (a) PC is not a partitioning type, but rather a general term for personal computers. Lastly, option (d) BIOS does refer to firmware used to perform hardware initialization during the booting process, but it is not a disk partitioning type. Therefore, options MBR and GPT are valid partitioning types.