switch $($phoneDigit$)\{$ case $1$: num $=1$; $$ break; case $2$: num $=2$; $$ break; case $3$: num $=3$; $$ break; case $4$: num $=4$; $$ break; default: num $=0$; break; $\}$ Looking at the example above, what happens if the break is omitted? a$.$ num is always assigned $0$ b$.$ num is never assigned a value c$.$ a syntax error is generated d$.$ num is assigned $1$