How are I/O timeout and Safety I/O timeout calculated?

How are I/O timeout and Safety I/O timeout calculated?
A . An I/O connection will timeout based on the lower of 4x RPI or 100ms. Safety I/O timeout is calculated as 4xRP
C . An I/O connection will timeout based on the lower of 3x RPI or 100ms. Safety I/O timeout is calculated as 3xRP
E . An I/O connection will timeout based on the lower of 4x RPI or 150ms. Safety I/O timeout is calculated as 2xRP
G . An I/O connection will timeout based on the lower of 3x RPI or 150ms. Safety I/O timeout is calculated as 3xRP

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Answer: A