Which statement about the trap instruction is NOT true?

Question

Answer

When a trap is executed, the three register parameters contain 
 
codes telling the operating system what the user wants to do

Answer

A user program can use trap to request the operating system to do something

Answer

Whenever trap is executed, it always halts the program

Answer

trap can be used to request that the program should be terminated

Answer

trap can be used to request input/output

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