What is a characteristic feature of simple epithelium?

Epithelial tissue serves as

Identify the diagram and find the correct answer $:-$

The type of epithelium which lines the inner surface of fallopian tubes $-$

Where is the stratified squamous epithelium found?

Which of the following statements are correct regarding the given tissue?
$I -$ Single layer of cuboidal cells.
$II -$ Found in ducts of glands and tubular parts of nephrons in kidneys.
$III -$ Main function is secretion and absorption.
$IV -$ The epithelium of the proximal convoluted tubule $(PCT)$ in the nephron has microvilli.