SFP is LC:
all SFP and SFP+ optics require LC connectors so the question becomes when you need single mode fiber or multi mode fiber but the connectot type is clear. SC square connectors are too big to fit in a SFP or SFP+.
GBIC is SC:
GBIC is commonly used with Gigabit Ethernet and Fibre Channel. But its applications are not limited to these two types. There is also Fast Ethernet (FE) GBIC, BIDI GBIC, CWDM GBIC, DWDM GBIC, etc. Generally, GBIC is with the SC connector.Jan 14, 2015
The question is really about connector types. My answers were Googled.
https://www.cisco.com/c/en/us/td/docs/routers/7200/install_and_upgrade/gbic_sfp_modules_install/5067g.html
Table 4 GBIC Module Specifications
GBIC is SC and SFP is LC
Because GBIC is old and still uses SC. SFP are smaller and cannot fit SC connectors therefore they use LC
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