This same question was recently asked by you on English Language Learners wasn't it? I believe the answer there was that none of them are correct because all of them should say, "the Internet". Once that is fixed, then the only viable sentences are the ones that use "for the last few days", "in the last few days" and "in a few days". Although the meaning of the last one is different.
adverbs - The variations of in/for the last few days - English Language ...
Is if you're treating the two days as a single length of time; are if you're treating them as multiple lengths of time.
Two days "is" or "are"? - English Language & Usage Stack Exchange
So when we say 'the past few days' we mean the complete set of 'past few days', not just some of them, and which means this time phrase matches the tense. Do we use the phrase 'past few days' on its own? Highly unlikely, it lacks a sense of which days.
meaning - Past few days or the past few days? - English Language ...
I would like to know if there is a common abbreviation for days of the week in a two letter form. I mean: Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday; can be abbreviated as Su, ...
Sometimes I use the phrase "back in the old days". I was recently in a class where the trainer kept using the phrase "olden days." Which usage is acceptable?
"Old days" or "olden days"? - English Language & Usage Stack Exchange
Words exist to label periods of time - like week which represents 7 days and fortnight which is used for a 14-day period. Are there other such words used for certain numbers of consecutive days?