supported PDF conformance in Anglar PDF Viewer component

The PDF Viewer supports the following conformance levels:

• PDF/A-1a
• PDF/A-1b
• PDF/X-1a
• PDF/A-2a
• PDF/A-2b
• PDF/A-2u
• PDF/A-3a
• PDF/A-3b
• PDF/A-3u
• PDF/A-4
• PDF/A-4e
• PDF/A-4f