A system may become infected by some spyware through the internet or e-mail. Eighty percent of the time the spyware arrives via the internet, twenty percent of the time via e-mail. If it enters via the internet, the system detects it immediately with probability 0.7. If via e-mail, it is detected with probability 0.9. Let N be the event that the spyware enters the system via the internet. Let E be the event that the spyware enters the system via e-mail. Let D be the event that a system detects the spyware. find P(D) Probability that the system detects the spyware?

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