Which sentence best describes the purpose of a constant?

a$.$ It corresponds to a memory location where data can be stored and easily chianged during program code execution.

b$.$ It provides a named location in memory that holds a value that does nott change, making programming code changes easier.

c$.$ It provides a data element.

d$.$ It provides an object characteristic and can be used to identify classification patterns so a programmer can design programs with logical input templates.