Who among the following was the head of the Government that was overth

Who among the following was the head of the Government that was overthrown by the Bolsheviks in the 1917 Revolution ?

Alexander Kerensky
Prince Lvov
Grand Duke Sergei
Tsar Nicholas II
This question was previously asked in
UPSC NDA-1 – 2021
The 1917 Russian Revolution involved two main phases. The February Revolution overthrew the Tsar. The subsequent Provisional Government, initially led by Prince Georgy Lvov and from July 1917 onwards by Alexander Kerensky, was the government overthrown by the Bolsheviks in the October Revolution.
Alexander Kerensky was the head of the Provisional Government when the Bolsheviks seized power in October 1917 (November in the Gregorian calendar).
Tsar Nicholas II was the last Emperor of Russia, overthrown in the February Revolution. Prince Lvov was the first head of the Provisional Government but resigned. Grand Duke Sergei Alexandrovich was an uncle of Nicholas II, assassinated in 1905.