A developer is writing unit tests for the following method: public static Boolean isFreezing(String celsiusTemp){ if(String.isNotBlank(celsiusTemp) && celsiusTemp.isNumeric()) { return Decimal.valueof(celsiusTemp) <= 0; } return null; } Which assertion would be used in a negative test case?

A. System.assertEquals(true, isFreezing(null))
B. System.assertEquals (true, isFreezing('0')
C. System.assertEquals(null, isFreezing('asdf'))
D. System.assertEquals(true, isFreezing('IOO'))

Suggest answer: C

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