Update anomalie exists when $...$

Select one:

a$.$ The process inserts null values in some of the rows

b$.$ The process delete some of the data unintentionally

c$.$ All of the above

d$.$ The process has to visit multiple rows

everyone is saying that it should be option d but if we look at the update anomalie in a broder aspect then updating may cause a null value or some value might be unintentionally deleted which implies that update anomalie includes insertion and deletion as well.I am confused.