What is the term used for the iris opening of a lens usually measured in f-stops?

Hans Holbein was the court painter to __________

a. Francis II b. Philip II c. Henry VIII d. Louix XVI

What was the primary function of the earliest Sumerian writing?

A. To keep records of trade and commercial exchange B. To record ancestral lineage among rulers C. To codify a standard set of legal guidelines D. To create a literary record of cultural myths and beliefs