Question

Which three OpenStack components does Nova need to function?
(a) Neutron, Horizon and Glance
(b) Glance, Keystone and Horizon
(c) Keystone, Glance and Neutron
(d) Cinder, Swift and Kolla

Answer 1

$\bf\huge\color{red}\mathbb{ HELLO\: MATE!}$

$\bf\color{red}\mathfrak{thanks \:for\: asking\: this\: question !}$

$<b> here's your answer!$

$\color{blue}{(C) KEYSTONE,\: GLANCE\: AND\: NEUTRON }$

$\green{\boxed{\bold{\underline{ hope \: it \: is \: helpful}}}}$

Answer 2

Answer: (b) Glance, Keystone and Horizon

The three OpenStack components which Nova needs in order to function properly, or in other words, the dependencies of Nova are Keystone, Horizon, and Glance.

So, the correct choice of answer for the given question from the given list of possible answers is (b) Glance, Keystone, and Horizon.  

It requires "Keystone" for performing "authentication", "Horizon" for its "Web interface", and "Glance" for "supplying its images".