How many gigabytes are in one terabyte?

One terabyte is equal to 1,000 gigabytes when considering the decimal system, which is commonly used in data storage contexts where each unit is multiplied by 1,000. This is the standard measurement in many consumer electronics and storage device specifications.

In some technical contexts, particularly in computer science, a terabyte can also be viewed as 1,024 gigabytes due to the binary system, where each unit is multiplied by 1,024. This situation often leads to confusion as storage devices may round their sizes for consumer ease.

However, in the context presented, the option stating 1,000 gigabytes accurately reflects the most common understanding of a terabyte as defined by the International System of Units (SI). Thus, this option correctly represents the relationship between terabytes and gigabytes as per standard decimal measurements.