Sunni and Shiite groups are defined as

A) new religious movements.
B) sects.
C) denominations.
D) fundamentalist movements.

Sunni and Shiite are both considered denominations within Islam. They differ in their interpretation of the succession of leadership after the death of the Prophet Muhammad, but they both adhere to basic Islamic beliefs and practices. While they may have some differences in their religious practices and traditions, they are not considered to be new religious movements, sects, or fundamentalist groups.