Task: Question Answering
Input (English): Problem: the telephone company wants to add an area code composed of 2 letters to every phone number . in order to do so , the company chose a special sign language containing 124 different signs . if the company used 122 of the signs fully and two remained unused , how many additional area codes can be created if the company uses all 124 signs ? 
Options: a ) 246 , b ) 248 , c ) 492 , d ) 15,128 , e ) 30,256
Output (English): c