Which of the Following Is/are an Assumption(s) for Calculating a Standard

Which of the following is/are an assumption(s) for calculating a standard deviation?
I.Requires interval or ratio data.
II.Requires ordinal, interval, or ratio data.
III.Requires a perfectly normal distribution of the data.
IV.Requires an approximately normal distribution of the data.
V.Requires highly skewed data.

A) I
B) II
C) III & V
D) I & IV
E) I & III