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Which of the following function(s) defined below are continuous at the origin? `(a)f(x)={xcos(1/x) ifx!=0 and 0ifx=0` `(b)g(x)={(x^8+x^4+2x^2)/(sinx)ifx!=0 and 0ifx=0` `(c)h(x)={sinxcos (1/x)ifx!=0 and 0ifx=0` `(d)p(x)={(x ln(cosx)/(ln(1+x^2))ifx!=0 and x ifx=0`

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