If you play originals & some of the songs are written around basslines, then your band will have realised that you are a major component of the band's sound. My band have told me this whenever I miss any rehearsals, but if we had a gig & I couldn't make it, I would ask them to get someone & I would go over basslines with them if they wanted.
I know my job is safe in both bands, not because I'm good on bass, but because I help write songs & I get on great with the band (I didn't know them before we formed except the guitarist who I knew from work, but didn't work beside).
I didn't vote because none of the answers fall under what I would do. First one is closest tho.
Good luck with your next gig.