Which of the following statements is incorrect? a. s and s1 are two pd. Series objects, we cannot use s. append(s1) to directly append s1 to the existing series s
b. s is a pd. Series object, then we can use s. loc[label] to get all data where the index is equal to label.
c. we can use s. iteritems() on a pd. Series object s to iterate on it.
d. loc and iloc are two useful and commonly used Pandas methods.