Operating System (OS)
The term 'polling' in a computer means a process by which a computer system

None of these
inquires to see if a terminal has any transaction to send
multiplexes the inputs and updates the memory accordingly
detects/corrects errors
decides correct alternative by analysing several ones

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Operating System (OS)
Assembler language

is usually the primary user interface
None of these
is quite different from the SCL interpreter
requires fixed-format commands
is a mnemonic form of machine language

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Operating System (OS)
The function(s) of the Syntax phase is(are)

None of these
to build a uniform symbol table
to build a literal table and an identifier table
to recognize the major constructs of the language and to call the appropriate action routines that will generate the intermediate form or matrix for these constructs.
to parse the source program into the basic elements or tokens of the language.

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