Which of the following reactions is/are electrophilic substitution?

(1).  Is electrophilic substitution reaction i.e., Bromination, because $-\mathrm{Br}$ is an electrophile.
(2). Is electrophilic substitution reaction, because $\stackrel{ \oplus }{-\mathrm{N}}{\mathrm{O}}_2$ is an electrophile.
(3). Is electrophilic substitution reaction i.e., sulphonation, because $-{\mathrm{SO}}_3$ is an electrophile.