Changing W4 after spouse started working

My spouse started working in Dec 2021 and will be getting her first paycheck by year end. So far in W4, I had claimed W4-Allowance=2, but since my spouse started working, I need to change it. Looks like W4 has changed since last time I filled it (back in 2017).
My annual income (Salary RSU) = ~340K  [W2]
Spouse's annual income = 70k [W2]

How should I fill new W4?
Step 2 has an option to select (c) if both of them are similar paying jobs. I am not sure what "similar" means here. Is it the earnings or the way it is earned (W2, 1099, self employed etc.)?

PS: No children or dependents

 

Any other suggestions?

Thank you in advance.