An Alliance between Germany, Austria-Hungary, and Italy prior to WWI

The correct answer is the Triple Alliance of 1882.
The Triple Alliance, a great secret agreement between Germany, Austria-Hungary, and Italy formed in May 1882 and renewed periodically until World War I. Germany and Austria-Hungary had been closely allied since 1879. Italy sought their support against France shortly after losing North African ambitions to the French. The treaty provided that Germany and Austria-Hungary were to assist Italy if it were attacked by France without Italian provocation; Italy would assist Germany if Germany were attacked by France. In the event of a war between Austria-Hungary and Russia, Italy promised to remain neutral. This abstention would have the effect of freeing Austrian troops that would otherwise have been needed to guard the Austrian-Italian border.