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[#191] For any 4-ary FSK, the signal set is given by $${s_k}left( t
ight) = sqrt {frac{{2E}}{T}} cos left[ {frac{pi }{4}left( {n + k}
ight)t}
ight]
,0 leqslant t leqslant T,,k = 1,,2,,3,,4$$ The dimension of its signal space is

(A) 1

(B) 2

(C) 3

(D) 4

Correct Answer

(D) 4