When the less than $(<mtext\; id="EditorElement\_1242059"></mtext><mi\; id="EditorElement\_1242060">)</mi>$ operator is used between two pointer variables, the expression is testing whether

a$.$ the value pointed to by the first is less than the value pointed to by the second.

b$.$ none of these

c$.$ the first variable was declared before the second variable.

d$.$ the address of the first variable comes before the address of the second variable in the computer's memory.

e$.$ the value pointed to by the first is greater than the value pointed to by the second.