— Analytical Chemistry — Spectroscopy Chemistry Question

Natural antimony consists of the following 2 stable isotopes: ¹²¹Sb, ¹²³Sb. Natural chlorine consists of the following 2 stable isotopes: ³⁵Cl, ³⁷Cl. Natural hydrogen consists of the following 2 stable isotopes: ¹H, ²H. How many peaks are expected in a low resolution mass spectrum for the ionic fragment SbHCl⁺?
(a) 4 ( )
(b) 5 ( )
(c) 6 ( )
(d) 7 ( )
(e) 8 ( )
(f) 9 ( )