[多选题] With middleware we can

1、[多选题]The Application layer in TCP/IP Model is correspond to＿＿＿＿＿＿＿＿in OSI Model

• A、Network Layer
• B、Session Layer
• C、Application Layer
• D、Presentation Layer
• E、Transport Layer

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2、[多选题]What make it is difficult to agree on how to count viruses?

• A、new virus arise from an existing virus
• B、some viruses can use polymorphic technique
• C、just a trivial change may creaｔe a new virus
• D、some viruses can creaｔe different versions when they infect other programs

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3、[多选题]A program is a sequence of＿＿＿＿＿＿＿＿that can be eｘecuted by a computer.It can either be built into the hardware or exist inde pendently in the form of＿＿＿＿＿＿＿＿.

• A、data
• B、hardware
• C、instructions
• D、software

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4、[多选题]which is the threat to computer security in the following choices?

• A、Computer Criminals
• B、Computer Crime
• C、earthquake
• D、Human Errors

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5、[多选题]()is a type of eｘecutable file.

• A、EXE file
• B、COM file
• C、JPG file
• D、TXT file

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