$$ {Cos^4 +Sin^4 }={2 over3} $$ then the value of $$ {Cos^2 -Sin^2 +1}$$?

• A. $$ {13 over15} $$
• B. $$ {14 over15} $$
• C. $$ {15 over14} $$
• D. $$ {15 over13} $$