The black-and-white film from the year Adolf Hitler came to power purports to show future British king Edward VIII instructing his nieces, the current monarch Elizabeth, aged about six or seven at the time, and her three-year-old sister, Princess Margaret, how to perform the Nazi salute.
Take context from the input text and decide on the accurate relationship between 'Edward VIII' and 'king' from the options provided.
Options: position held, product/material produced, chairperson, headquarters location