Mathematics

Problem

Which of the following best describes a critical number of a function

f

defined on an open interval? a) A number

c

in the domain of

f

for which

f''(c)=0

. b) A number

c

in the domain of

f

for which

f'(c)=0

. c) A number

c

in the domain of

f

for which

f'(c)=0

f'(c)

does not exist. d) A number

c

in the domain of

f

for which

f(c)=0