A transaction can do only read operation and not write

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A transaction can do only read operation and not write operation on a data item when it acquires ……. lock.
A. read mode
B. exclusive mode
C. shared mode
D. write mode

Ravi Garg edited question
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    Simi Kaur (anonymous)

    Its (c) shared mode..

    there are two types of lock :
    1) exclusive n 2) shared lock

    and shared lock permit read but not modification

    Simi Kaur answered
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