For this case, identify the internal control weakness and the potential business problem, and suggest a solution. $(3$ marks$)$

Carole Tobias purchases supplies for Z Dealership and stores them in a locked room to which she has the key. She is also responsible for distributing these supplies to employees upon request. At the end of each month, Carole takes an inventory of the supplies on hand and notifies the accounting department of the amount of the adjusting entry for supplies used.