What does the following relational algebra expression do?

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answerhappygod
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What does the following relational algebra expression do?

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σamount > 1200 (loan)
a) Finds all the tuples in loan
b) Finds the tuples in loan where the amount is greater than 12000
c) Finds all the tuples in loan where the amount is greater than 1200
d) Finds all the amounts in loan where the number of values is greater than 1200
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