How many bundles must a carrier carry to be required to pay one fare?

In the context of carrier fare structures, the rule regarding bundles often relates to how many items or specific units a carrier must possess to be obligated to pay a fare. Typically, if the system mandates that a single bundle is the threshold for fare payment, then carrying just one bundle meets that requirement. This means that the carrier is responsible for paying a fare once they have at least that minimum unit (one bundle), as it signifies the beginning of fare obligations.

Higher numbers, such as two or three bundles, indicate a greater quantity that may not be necessary for fare payment. The option that indicates any amount is too broad since it may imply that no specific count is required for fare payment, which does not align with the outlined rules in many transport systems. Moreover, the focus is generally on the least number required; in this case, one bundle is sufficient to fulfill the criteria for fare payment.