Question $2$d

Which of the following expressions is used as the busy$-$wait condition when polling to

transmit data in the UART? Such as:

while $($expression$)\{\}$

UART$6\_$FR$\_$R & $0$x$10$

UART$6\_$DR$\_$R & OxFF

$($UART$6\_$FR$\_$R & $020)==0$

UART$6\_$FR$\_$R & $0$x$20$

$($UART$6\_$FR$\_$R & $010$