From an Operations Management Perspective, Which of the Following Does

From an operations management perspective, which of the following does a manufacturing firm's supply chain include?

A) the flow of materials and finished goods through all firms involved in production and distribution, plus the corresponding flows of services, financial resources, and information
B) firms connected with the flow of output through the channel to the final customer, particularly those other companies involved with financial transactions
C) only vendors that supply goods and services in the production of a firm's product offerings
D) all and any forms of software or manufacturing technology it uses in its operation