Answer Posted / sv

Automatic
External
Static
Register

Automatic is local storage applied for local variables.

External is global variable,which shall be accessed through
out the program at any modules.

Static retains its values and live till end of the program,
but not visible to all modules, hence accessible with in
the scope.

Register: In few program, where performance is high
importance we can use register storage, so that access
overhead is less.In this storage type , an varible always
uses the register for read/write.

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