The diagram below identifies the elements of service as provided by a soft drink vending machine.Each element has an estimate of its own reliability,independent of the others.What is the reliability of the "system"? 
Definitions:
Bluetooth Connection
A wireless technology standard for exchanging data over short distances between electronic devices.
Encrypted Files
Digital documents that have been converted from a readable form to an encoded version that can only be decrypted and understood by those who have the necessary decryption key.
Network Attached Storage
A dedicated file storage device connected to a network, allowing multiple users and client devices access to shared data.
Wireless Network Keys
Security codes used to access encrypted Wi-Fi networks, protecting them from unauthorized use.
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