Find the mismatch
`{:("(a) Sky wave communication",:,"Frequency upto 30 MHz"),("(b) Line-of-sight communication",:,"Frequency greater than 40 MHz"),("(c) Mobile telephony",:,"Frequency range 800-950kHz"),("(d) Facsimile",:,"Static document"),("(e) Ground wave propagation",:,"Frequency less than a few MHz"):}`

Answer

C

Explanation

For mobile to base station frequency range between 896 - 901 MHz and for base station to mobile frequency rage is 840 - 935 MHz. So, option (c) is mismatch here.