Which is the lowest Gateway version manageable by SmartCenter R77?

Answer A:

R77 Installation and Upgrade Guide for Gaia Platforms
https://sc1.checkpoint.com/documents/R77/CP_R77_Gaia_Installation_and_Upgrade_Guide/html_frameset.htm

Compatibility with Gateways
The R77 Security Management Server can manage gateways of these versions.
Release
Version
Security Gateway:

NGX R65
R70, R70.1, R70.20, R70.30, R70.40, R70.50
R71, R71.10, R71.20, R71.30, R71.40, R71.50
R75,
R75.10, R75.20, R75.30, R75.40, R75.45, R75.40VS, R75.46, R75.47,
R76, R77

Security Gateway 80:

R71.45

61000 Security System:

61000 R75.035
61000 R75.05x
R75.40VS for 61000
R76SP

DLP-1:

R71 and higher

IPS-1:

R71

VSX:

VSX R65, VSX R65.10, VSX R65.20, VSX R67, VSX R67.10, R75.40VS, R76, R77

Connectra:

Centrally Managed NGX R66

UTM-1 Edge:

7.5.x and higher*

GX:

4.0, 5.0