For $2023,$ which of the following correctly describes the function of Schedule M$-2$ on Form $1065?$

a$)$ Tracks the partners' outside bases.

b$)$ Tracks the partners' tax$-$basis capital accounts.

c$)$ Reconciles the book and tax$-$basis capital accounts.

d$)$ Reconciles net income per books, with net income according to the tax return.