Explanation:

Memory measurement units are based on bytes, often prefixed to denote larger quantities. 'Tb' stands for Terabyte, a unit of digital information storage equal to $2^{40}$ bytes or approximately $10^{12}$ bytes, commonly used for large storage capacities. Option (c) is correct. 'Lb' (pound) is a unit of mass. 'Mg' (megagram or metric ton) is also a unit of mass. 'GHs' is not a standard unit of memory measurement; 'GHz' (gigahertz) is a unit of frequency. 'Sb' is not a standard unit of memory measurement. Thus, 'Tb' is the only valid unit for memory measurement among the given choices.