The sum of the coefficients of all even degree terms in x in the expansion of\({\left( {{\rm{x}} + \sqrt {{{\rm{x}}^3} - 1} } \right)^6} + {\left( {{\rm{x}} - \sqrt {{{\rm{x}}^3} - 1} } \right)^6}\), (x > 1) is equal to:

• A. 29
• B. 32
• C. 26
• D. 24