How many extraneous solutions exist for the logarithmic equation below if it is solved in the most efficient way possible? log_(2)[log_(2)(\sqrt(4x))]=1?

Given the numbers c = –3 and d = 4, which statement is true? a. |–c| = 3 and |–d| = –4 b. |–c| = 3 and –|d| = –4 c. –|c| = –4 and –|d| = 3 d. |–c| = 3 and –|d| = 4