A user is attempting to format a $4$ TB HDD using NTFS but only has the option to format the disk with a size of approximately $2TB.$

What is the most likely reason the user is unable to format the disk to its full capacity?

a$.$ The disk is using the MBR partitioning scheme.

b$.$ The user chose a primary partition instead of an extended partition.

c$.$ The disk is using the GUID partitioning scheme.

d$.$ NTFS only supports up to $2\mathrm{.}2$ TB volume sizes.