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Electronic configuration of Cu is 3d10 4s1. Which rule is violated in this configuration?

Electronic configuration of Cu is 3d10 4s1. Which rule is violated in this configuration? Correct Answer 3d10 4s1. Which rule is violated in this configuration? ] Aufbau Principle

According to the Aufbau principle, orbitals of lower energy are completely filled before electrons start occupying higher energy orbitals. But in copper, higher energy 3d is filled before lower energy 4s. Such violation of the Aufbau principle appears in about 20 elements.

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[Ar] 3d10 4s1 ইলেকট্রন বিন্যাসটি কোন মৌলের?
In the question below, are given a statement followed by three courses of actions numbered I, II and III. On the basis of the information given, you have to assume everything in the statement to be true, and then decide which of the following suggested courses of actions logically follow(s) for pursuing. Statement: Soon VAT 69 whiskey and Smirnoff Vodka will not be found on the shelves of Delhi Liquor stores owing to the duplication of barcode by manufacturer United Limited. The Delhi government financial commissioner blacklisted the manufacturer. Financial commissioner Anindo Majumdar had said in an order dated September 14, that USL had violated provisions of the Delhi Excise Act, 2009 and Delhi Excise Rules, 2010 by using unauthorized and loose barcodes, which could be easily misused. Courses of action: I. The ban will force United Spirits Limited not to sell its liquor in the national capital for two years. II. the appellant violated provisions of the Delhi Excise Act, 2009, Delhi Excise Rules, 2010, the terms and conditions of the license issued to it and the standard operating procedure framed by the Delhi Excise Department and that consequently the department has rightly imposed the penalty of blacklisting under Rule 70 of the Delhi Excise Rules, 2010 upon United Spirits LTD (USL), Aurangabad. III. United Limited has been blacklisted by the Delhi government financial commissioner.
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