Anyone know how the netcode works for Sombra's Hack?

I haven't been able to find this information anywhere and I wish blizzard wasn't so secretive about what goes on under the hood. Back when I used to play CS, I could easily find such information.

So my question is, does anyone know the relationship between the ping of the player who is on Sombra and how long hack takes to cast/register?

Blizzard could've built it in one of four ways imo: (1) The hack is performed client-side and the information is sent to the server about whether or not the hack "finished" on the target. (2) The hack is performed server-side, meaning the client sends info to the server it intends to use the ability "hack" on X target. The server then starts the "hack" timer, and if that timer finishes without an interrupt notification from the client, the hack finishes and the target is hacked. (3) The client sends the information to the server that it wants to hack, the server starts the hack timer, then the server is the one to check for hack interrupts. (4) The client sends the hack request to the server, the server receives the request, the server sends a notification to the hack target, THEN the server starts the hack timer, adding on the last known ping of the hacker and intended target to the total time the hack will take. If an interrupt is received before that timer is up, the client is notified their hack is cancelled.

As a player with high ping, I suspect that old Sombra used to be #2, but now I suspect it's #3 or #4. I haven't been able to play her for the last year because my hacks-never-finish. My hacks take on average over a second, and if I do anything during that time to stop my cast thinking that I'd been channeling it for long enough, the hack gets cut off, even when its been casting for way too long.

Anyhow this is a long winded way of asking if anyone knows the answer to this question. As best I can tell, the hack version that's been around for the last year punishes me for my ping twice or worse.