Express each of these sets using a regular expression. a$.(4$ pts$)$ The set containing all strings with $0,1,$ or $2$ bits. b$.(4$ pts$)$ the set of strings of two $0$s$,$ followed by $0$ or more $1$s and ending with a $0.$ c$.(4$ pts$)$ the set of strings with every $1$ followed by two $0$s$.$ d$.(4$ pts$)$ the set of strings ending in $00$ and not containing $11.$ e$.(4$ pts$)$ the set of strings containing an even number of $1$s$.$