अंकगणितीय रेखा आरेख (काल श्रेणी आरेख) के माध्यम से प्रस्तुत डेटा मुख्य रूप से निम्नलिखित में से किस परिवर्तन को समझने में मदद करता है?

In the context of the tabular presentation of statistical data, consider the following statements: Statement I: A statistical table must invariably contain one caption (title) at the top and one footnote at the bottom to ensure clarity, uniformity, and proper explanation of special entries. Statement II: The stub of a table refers to the leftmost column, which contains the headings for the rows and helps in identifying the nature of data presented horizontally. Statement III: For a well-constructed table, the extent of sub-classification under headings and subheadings should be kept to a minimum to avoid unnecessary complexity and maintain readability. Which of the above statements is/are correct according to the principles of tabular presentation?

A firm producing handcrafted furniture records its monthly sales over a year to forecast next year's production levels. The data show seasonal variations due to festivals. Which form of data presentation will best help analyze this trend?