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The word lag (l.19) can be substituted without changing the literal meaning by
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Consider the statements below in relation to the text.
I - There seems to be an unsolved contradiction between heavy investments on IT and the expected results. II - There are still no accurate ways to measure the impact of IT on productivity growth. III- In the 90s, information technology finally helped to raise the productivity growth rates.
Which ones are correct?
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Select the alternative that adequately fills in the blanks in lines 09,10 and 19.

    Forensic computer analysts investigate crimes against computers, such as hacking, as well as crimes involving computers. They might search a suspect’s computer hard drive for incriminating files, pictures or other documents. They might also track the Internet activity of a suspect or victim to determine what sites he visited and whom he communicated with. In addition, they can often reveal information that suspects have attempted to hide, such as determining where an email or other electronic communication originated from even if the sender concealed his computer’s IP address to mask his location.

Internet: http://oureverydaylife.com (adapted).

According to the text, forensic computer analysts