A Firm's Financial Managers Have Been Asked to Evaluate the Following

A firm's financial managers have been asked to evaluate the following investment proposals: 1. a new mainframe computer to replace an existing computer for administrative processing
2. a new assembly line to expand production capacity
3. new kitchen equipment for an existing cafeteria kitchen
4. new food vending machines to replace the existing cafeteria kitchen
Which of the above proposals are mutually exclusive?

A) 1 and 2
B) 3 and 4
C) 1, 2, and 3
D) 1, 2, 3, and 4