Which of the following sequences of events are most accurate?

Assassination of Franz Ferdinand > Germany supports Austria-Hungary > Russian supports Serbia > German declares war on Russia.
Assassination of Franz Ferdinand > Germany declares war on France > Great Britain supports France > France declares war on Germany.
Assassination of Franz Ferdinand > Germany supports Austria-Hungary > Russia declares war on Austria-Hungary > Germany declares war on France.
Assassination of Franz Ferdinand > Germany declares war on Austria-Hungary > Russia declares war on Germany > Germany invades Belgium.

The most accurate sequence of events is:

Assassination of Franz Ferdinand > Germany supports Austria-Hungary > Russia declares war on Austria-Hungary > Germany declares war on France.

The most accurate sequence of events is:

Assassination of Franz Ferdinand > Germany supports Austria-Hungary > Russia declares war on Austria-Hungary > Germany declares war on France.