feat: update responses

ref: #955 (comment)

tools/ossf_best_practices/silver_criteria.md

@@ -313,7 +313,7 @@ https://github.com/nodejs/node/blob/main/doc/contributing/releases.md#11-tag-and
 
 > Hardening mechanisms SHOULD be used in the software produced by the project so that software defects are less likely to result in security vulnerabilities.
 
-_Possible answers: Met/Unmet/NA_
+**NA**
 
 > The project MUST provide an assurance case that justifies why its security requirements are met. The assurance case MUST include: a description of the threat model, clear identification of trust boundaries, an argument that secure design principles have been applied, and an argument that common implementation security weaknesses have been countered. (URL required)