Write an assembly code sequence to set bit $0$ and bit $3$ of this register without changing any of the other values in this register. $(5$ marks$)($b$)$ What external pins of the PIC$24($in the $28-$Pin SPDIP Package$)$ are these specific bits associated with? Give their exact pin numbers. $(5$ marks$)($c$)$ In your own words, what is the function of the PORTx registers in relation to the GPIO functionality of the PIC$24?(5$ marks$)$