Select all loops with the correct syntax.
a)
var i = 3
while (i > 0) {
println(i)
i--
}
println("Completed")
b)
var i = 3
while (i > 0) {
println(i)
i--
} else {
println("Completed")
}
c)
var i = 3
do {
println(i)
i--
} while(i > 3)
d)
var i = 3
while (i > 3) do {
println(i)
i--
}
println("Completed")