Classify as True or False, Assuming That A, B, C $\mathrm { d } \neq 0$

True/False

Classify as true or false, assuming that a, b, c, and d are whole numbers an $\mathrm { d } \neq 0$
- $$\text { If } \mathrm { d } \nmid ( \mathrm { a } + \mathrm { b } ) \text {, then } \mathrm { d } \nmid \mathrm { a }$$