A campaign manager for a political candidate must arrange the shipment of 150 cartons of campaign buttons from three button producers to three campaign headquarters.The supplies and demands,and the per-carton transportation costs,are shown below: 
Which of the following is a constraint for the customer (campaign headquarters) ?
Definitions:
Tipping Behavior
The practice of giving money as a bonus for services provided, often influenced by social norms, satisfaction, and cultural factors.
Internal Validity
The extent to which research findings are free from contamination by extraneous variables.
Drug Conviction
A formal judgment by a legal authority determining that an individual is guilty of a drug-related offense.
Fake Profiles
False or fabricated online personas created on social media platforms or websites, often for deceptive purposes.
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