Using the table of classification of recommendations, indicate which grade should be given to the following statement: Surgeons with experience performing a new heart procedure indicate that the new procedure produces a major improvement in cardiac performance.

Classification of Recommendations

$\backslash$table$[[$Quality of the,Net Benefit,Net Benefit,Net Benefit,Net Benefit$],[$Evidence$,$Substantial,Moderate,Small,Zero$/$negative$],[$Good$,$A$,$B$,$C$,$D$],[$Fair$,$B$,$B$,$C$,$D$],[$Poor$,$I,$1,$I,I$]]$

Adapted from United States Preventive Services Task Force