Modern liquid crystal displays have a pixel count of:
(A). Greater than 200 pixels per inch.
It must have been a long time since the 200 pixels displays were used. An easy answer to pick as other choices limit the number of pixels well below what is in use.
A good discussion on radar displays is listed on the Practical Sailor site, article Entry-Level LCD Radars
For historical and technical overview, please see Zoboko site for the article 2.8 The Radar Display and User Controls
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