Does not work in Gulp browserSync, in the terminal it gives Task never defined: browserSync, what should I do?

Question

gulp.js

Installed Gulp (v.4.0.2), but when run in the terminal, it gives an error Task never defined: browserSync (2.7.5) and does NOT display a blank page in the browser (as it should).

Code in gulpfile.js:

const {src, dest, watch,} = require('gulp');

const scss   = require('gulp-sass')(require('sass'));
const concat = require('gulp-concat');
const browserSync = require('browser-sync').create();

function browsersync(){
  browserSync.init({
    server: {
      baseDir: "#src/"
    }
  });
}

  
function styles(){
  return src('#src/scss/style.scss')
    .pipe(scss({outputStyle:'compressed'}))
    .pipe(concat('style.min.css'))
    .pipe(dest('#src/css'))
    .pipe(browserSync.stream())
}


function watching(){
  watch(['#src/scss/**/*.scss'], styles);
  watch(['#src/*.html']).on('change', browserSync.reload);
}


exports.styles = styles;
exports.watching = watching;
exports.browserSync = browserSync;

IN THE TERMINAL:

PS C:\Users\user\Desktop\fls-gulp> gulp browserSync
20:03:04] Using gulpfile ~\Desktop\fls-gulp\gulpfile.js
[20:03:04] Task never defined: browserSync
[20:03:04] To list available tasks, try running: gulp --tasks

Here is the result. Help me please.