1. Open
https://cabforum.org/wp-content/uploads/CA-Browser-Forum-BR-1.6.4.pdf
2. Search for "KeyUsage"
- 11 occurrences

#1
7.1.2.1 Root CA Certificate
 b. keyUsage
  This extension MUST be present and MUST be marked critical ...

#3
7.1.2.2 Subordinate CA Certificate
  e. keyUsage
   This extension MUST be present and MUST be marked critical ...

#5
7.1.2.3. Subscriber Certificate
  e. keyUsage (optional)
   If present, bit positions for keyCertSign and cRLSign MUST NOT be set.

3. Answer question :)
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