Which expression is equivalent to ◂◽˙▸(21x−2)0 ?(1 point) Responses ◂⋅▸3x2⋅◂⋅▸( 1 7 )x−23 times x squared times 1 seventh x to the negative 2 power ◂/▸ 7x2 7x2 the fraction with numerator 7 x squared and denominator 7 x squared ◂⋅▸0x2⋅21x40 times x squared times 21 x to the 4th power ◂◽˙▸(◂⋅▸21x12y)1