In which of the following are columnar epithelial cells with microvilli or a brush-like border 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.

Normal wear and tear of cells in simple epithelia is negligible because

Match the following:

Column-$I$	Column-$II$
$(a)$. Squamous epithelium	$(i)$ Lining of intestine
$(b)$. Cuboidal epithelium	$(ii)$ Ovary
$(c)$. Columnar epithelium	$(iii)$ Blood vessels
$(d)$. Ciliated epithelium	$(iv)$ Bronchioles

What is the function of a gap junction?

Match the List-$I$ with List-$II$:

List-$I$	List-$II$
$I$. Simple squamous epithelium	$a$. Gall bladder
$II$. Ciliated cuboidal epithelium	$b$. Ureter
$III$. Brush bordered columnar epithelium	$c$. Fallopian tube
$IV$. Urothelium	$d$. Air sacs of lungs