The Nasdaq Composite has dropped into a correction, down more than 10% from its all-time high of 16,212.23 on November 22. Tech volatility should prompt investors to focus on the ABCs of the sector – AI, big data and cybersecurity stocks, says UBS Global Wealth Management. The index through Thursday has lost 12.7% of its all time intraday high, according to the global wealth manager. Investors should adopt a ‘thematic approach’ to investing in the tech sector, UBS advised clients on Friday. Tech stocks have been stung in part from a surge in interest-rate yields on Treasury yields on the U.S. Treasury yields, said UBS. Nasdaq sold off Friday during the big session. . . .