Visitor Visa question

Indian_USA

Registered Users (C)
My parents have a visitor visa valid till November 8th,2003.
They are planning to come to USA from India in the month
of October.
My question is:
I heard valid date on visa is not the determining factor
for how long they can stay in USA but this is a date
considered only for landing here but immigration officer
at the port of entry will determine how long they can stay.

Is my understanding correct ?
Basically I am curious to know if an immigration officer can
put a date on I-94 which is beyond November 8th, 2003 ?

Any info on this is appreciated.
Thans in advance.
 
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