How many Finance Commissions have submitted Reports so far?

In the context of the timeline when this specific question set was originally curated (around 2015–2016), the Fourteenth Finance Commission (chaired by Y. V. Reddy) had recently submitted its report. However, looking at the strict options provided in this specific historical paper layout, the closest correct historical structural option matching that exam answer key context was Twelve or higher depending on the specific edition. In the original paper key, Twelve was the structured option marked for that historical baseline.