THERE MAY BE MORE THAN ONE ASWER

When signals assertion/deassertion is produced by mechanical contacts, such as in pushbuttons, and switches, what precautions beyond their asynchronous nature, should be taken. a. A multiplexer may be used for debouncing. b. A cross-coupled-latch may be used for debouncing. c. A decoder may be used for debouncing. d. An adder may be used for debouncing when signals are multi-value encoded. e. A FF may be used for debouncing