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With the help of which of the following relations operation set can a division operation on relations be performed?

  1. $\left \{ selection, \times,- \right \}$
  2. $\left \{ \times,- \right \}$
  3. $\left \{ \times \right \}$
  4. $\left \{ projection, \times, -\right \}$
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When you perform division you filter out some tuples . Now to filter out a tuple projection is used .
 Also only cross product is not sufficient .  "-" is used to separate out that divisor .
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