Given the URL https://example.com/blog/index.html, which part represents the "Protocol" or "Scheme"?

Name: CREST Olympiads
Address: Office No. 234, Spaze iTech Park, Tower-B2, 2nd Floor, Sohna - Gurgaon Rd, Sector 49, Gurgaon, 122018, IN
Telephone: +91-98182-94134

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A ://example.com
B /blog/
C https
D index.html