Question: The following activity is done in the class VII :<br> Students are given four iron bars out of which two are bar magnets. They are asked to identify the bar magnets. Which of the following process skills can be promoted through this activity ?

  Option 1: Observation, Estimation, Experimentation, Controlling variables.
  Option 2: Observation, Formulating hypothesis, Measuring
  Option 3: Observation, Classification, Inferring
  Option 4: Observation, Classification, Communication, Measurement
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