High$-$availability Seamless Redundancy $($HSR$)$ is standardised as:

Question $7$Select one:

A$.$

IEC$62439-3$

B$.$

IEC$61850-2$

C$.$

IEEE$803\mathrm{.}15\mathrm{.}4$

D$.$

ISA$100-11$A

E$.$

IEEE$508$