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PHP global variables are limited to... 1 point Same file Same scope Same function O Same class None of the above Which one of the following hurts web application performance ? 1 point put CSS at the bottom O put JavaScript at the bottom O minify CSS files minify JavaScript files All of the above None of the above 2 points Which of the following rules improve browser side performance? Check all that apply. Serve content by Gzip / brotli compression Turn on Keep-Alive for TCP connection Serve popular JS and CSS files external (ie from CDN) Avoid CSS expressions Add an Expires Header Use inline images O Minify JavaScript Which one of the following is incorrect action to optimize web application 2 points performance? Put script at the bottom O Use CDN for static assets O O Put stylesheets at the top