Final answer:
Analytic Snapshots in Salesforce do not support the Tabular report format, as it lacks aggregate functions required for historical data analysis.
Step-by-step explanation:
Within the context of Salesforce, Analytic Snapshots are used to report on historical data at scheduled intervals. Analytic Snapshots do not support all report types. Specifically, they do not support the Tabular report format. The Tabular report format is the simplest Salesforce report type, which is essentially a list of records that meet certain criteria but lacks the aggregate functions of other report formats such as Summary and Matrix reports. Graphical representations are not report types per se; they are visual components that can be added to reports in Salesforce, so it isn't a correct answer to the question about report types unsupported by Analytic Snapshots.