What value of x satisfies the equation $$\sqrt {{{\left( {121} \right)}_7}} = {\left( x \right)_2}?$$
(where integer numbers written as subscripts are the base of the corresponding number systems.)

A. 2TTL B. 5TTL C. 8TTL D. 10TTL

A. NAND gate B. OR gate C. AND gate D. None of the above

A. 6 B. 32 C. 64 D. 128

A. Base 10 B. Base 16 C. Base 8 D. Base 3