Why are the resonators not preferred for an oscillator circuit of 8051

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Module 2: The 8051 Architecture

20202m

Why are the resonators not preferred for an oscillator circuit of 8051?
(i) Because they do not avail for 12 MHz higher order frequencies
(ii) Because they are unstable as compared to quartz crystals
(iii) Because cost reduction due to its utility is almost negligible in comparison to total cost of microcontroller board
(iv) All of the above

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