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Answer:
Portable Network Graphics is the correct answer of this question.
Explanation:
Portable Network Graphics i is the graphics formats which we use for comic-style drawing Portable Network Graphics is a media structure that is used to compress digital video objects. Portable Network Graphics almost completely overtaken the Graphics Merge Standard (GIF),which has been commonly used during the history.
<u>For example</u>:- Portable Network Graphics images use lossless compression like GIF files.
- It has an indexed color raster image and is optimized with a data compression comparable to a GIF file.
- Portable Network Graphics files are widely used to store opaque background Web graphics, digital photographs and images.
Answer:12 days
Explanation:
Mean time to failure is given by
MTTF=
Let's say N is the average amount of time system runs until 
computer fail
MTTF of each computer =35
35=
N=
